Merge pull request #27 from ElVit/heatpump/feature/uart-task-handling

Use threads to read UART message

.github/workflows/test_panasonic_heatpump.yml

@@ -26,7 +26,7 @@ jobs:
     strategy:
       fail-fast: false
       matrix:
-        board: [esp8266, esp32s2, esp32c3, full]
+        board: [esp32s2, esp32c3, full]
     steps:
       - name: Checkout repository
         uses: actions/checkout@v4

components/maidesite_desk/README.md

@@ -6,7 +6,7 @@
 
 ### What you need
 
-* ESPHome compatible microcontroller (e.g. ESP8266, ESP32, ESP32-S2, ESP32-C3, ...)
+* ESPHome compatible microcontroller (e.g. ESP32, ESP32-S2, ESP32-C3, ...)
 * RJ12 cable (phone cable, RJ11 may also work)
 
 ### Wiring

components/panasonic_heatpump/README.md

@@ -4,13 +4,28 @@
 
 ### What you need
 
-* ESPHome compatible microcontroller (e.g. ESP8266, ESP32, ESP32-S2, ESP32-C3, ...)
+* ESPHome compatible microcontroller (e.g. ESP32, ESP32-S2, ESP32-C3, ...)
 * ADUM1201 Dual Channel Digital Magnetic Isolator  
   (to convert 5V UART signal from the heatpump to 3.3V UART signal of the ESP controller)
-* CN-CNT cable/connectors to Heatpump/CZ-TAW1 (see [Heishamon](https://github.com/Egyras/HeishaMon) github site for more information)
+* CN-CNT cable/connectors to Heatpump/CZ-TAW1 (see [Heishamon](https://github.com/heishamon/HeishaMon) github site for more information)
   * For example: [S05B-XASK-1 JST Connector](https://a.aliexpress.com/_EvkmGVo)
   * For example: [XAP-05V-1 5Pin Cable with Female to Female Connector](https://a.aliexpress.com/_ExPT82E)
 
+> [!IMPORTANT]
+> The support for ESP8266 and the arduino framework is deprecated for this component.  
+> Since v0.0.8 this component uses threads to process the UART communication.  
+> But if you still want to use an ESP8266 controller or the arduino framework,  
+> please use the branch "heatpump/arduino".  
+>
+> ```yaml
+> external_components:
+>  - source:
+>      type: git
+>      url: https://github.com/ElVit/esphome_components
+>      ref: 'heatpump/arduino'
+>    components: [ panasonic_heatpump ]
+> ```
+
 ### Wiring
 
 ![wiring_adum1201.png](../../prototypes/panasonic_heatpump/wiring_adum1201.png)
@@ -644,7 +659,7 @@ water_heater:
 
 ## Custom Entities (For Advanced Users)
 
-If you review the [ProtocolByteDecrypt.md](https://github.com/Egyras/HeishaMon/blob/master/ProtocolByteDecrypt.md) file you will find also some TOPs and SETs which are not implemented yet in heishamon.  
+If you review the [ProtocolByteDecrypt.md](https://github.com/heishamon/HeishaMon/blob/main/ProtocolByteDecrypt.md) file you will find also some TOPs and SETs which are not implemented yet in heishamon.  
 They are usually marked as TOP (without a number).  
 The nice part of ESPHome is that it is so highly customizeable.  
 So if you want some additional TOP or SET entities you can easily create your own.  
@@ -664,7 +679,7 @@ sensor:
     unit_of_measurement: °C
     lambda: |-
       // get the requried byte
-      int byte = my_heatpump->getResponseByte(46);
+      int byte = my_heatpump->get_response_byte(46);
       // a valid byte range is 0x00-0xFF
       // do not update if the byte is invalid
       if (byte < 0) return {};
@@ -678,7 +693,7 @@ text_sensor:
     update_interval: 3s
     lambda: |-
       // get the requried byte
-      int byte = my_heatpump->getResponseByte(9);
+      int byte = my_heatpump->get_response_byte(9);
       // a valid byte range is 0x00-0xFF
       // do not update if the byte is invalid
       if (byte < 0) return {};
@@ -703,5 +718,5 @@ After a power on the heatpump should respond to the requests.
 
 ## Sources
 
-:heart: A big THANKS to [Egyras](https://github.com/Egyras) and the work done on the repository [HeishaMon](https://github.com/Egyras/HeishaMon) for decoding the panasonic uart protocol and providing information to build hardware based on an ESP Chip.  
+:heart: A big THANKS to [Egyras](https://github.com/Egyras), [IgorYbema](https://github.com/IgorYbema) and the work done on the repository [HeishaMon](https://github.com/heishamon/HeishaMon) for decoding the panasonic uart protocol and providing information to build hardware based on an ESP Chip.  
 :heart: Thanks to the whole home assistant community for sharing their knowlege and helping me to create this ESPHome component!  

components/panasonic_heatpump/climate/panasonic_heatpump_climate.cpp

@@ -31,7 +31,7 @@ climate::ClimateTraits PanasonicHeatpumpClimate::traits() {
 
 void PanasonicHeatpumpClimate::control(const climate::ClimateCall& call) {
   if (call.get_mode().has_value()) {
-    int byte6 = this->parent_->getResponseByte(6);
+    int byte6 = this->parent_->get_response_byte(6);
     if (byte6 >= 0) {
       climate::ClimateMode new_mode = *call.get_mode();
       uint8_t newByte6 = this->setClimateMode(new_mode, (uint8_t)byte6);

components/panasonic_heatpump/helpers.cpp

@@ -4,13 +4,13 @@ namespace esphome {
 namespace panasonic_heatpump {
 static const char* const TAG = "panasonic_heatpump";
 
-void PanasonicHelpers::log_uart_hex(UartLogDirection direction, const std::vector<uint8_t>& data,
+void PanasonicHelpers::write_uart_log(UartLogDirection direction, const std::vector<uint8_t>& data,
-                                    const char separator) {
+                                      const char separator, bool logBytes) {
-  PanasonicHelpers::log_uart_hex(direction, &data[0], data.size(), separator);
+  PanasonicHelpers::write_uart_log(direction, &data[0], data.size(), separator, logBytes);
 }
 
-void PanasonicHelpers::log_uart_hex(UartLogDirection direction, const uint8_t* data, const size_t length,
+void PanasonicHelpers::write_uart_log(UartLogDirection direction, const uint8_t* data, const size_t length,
-                                    const char separator) {
+                                      const char separator, bool logBytes) {
   std::string logStr = "";
   std::string msgDir = direction == UART_LOG_TX ? ">>>" : "<<<";
   std::string msgType = direction == UART_LOG_TX ? "request" : "response";
@@ -31,6 +31,9 @@ void PanasonicHelpers::log_uart_hex(UartLogDirection direction, const uint8_t* d
   ESP_LOGI(TAG, "%s %s[%i]", msgDir.c_str(), msgType.c_str(), length);
   delay(10);
 
+  if (!logBytes)
+    return;
+
   logStr += byte_array_to_hex_string(data, length, separator);
 
   // Log in chunks to avoid ESP_LOG buffer overflow (https://developers.esphome.io/architecture/logging/).

components/panasonic_heatpump/helpers.h

@@ -18,8 +18,10 @@ enum UartLogDirection : uint8_t {
 
 class PanasonicHelpers {
  public:
-  static void log_uart_hex(UartLogDirection direction, const std::vector<uint8_t>& data, const char separator);
+  static void write_uart_log(UartLogDirection direction, const std::vector<uint8_t>& data, const char separator,
-  static void log_uart_hex(UartLogDirection direction, const uint8_t* data, const size_t length, const char separator);
+                             bool logBytes);
+  static void write_uart_log(UartLogDirection direction, const uint8_t* data, const size_t length, const char separator,
+                             bool logBytes);
   static std::string byte_array_to_hex_string(const std::vector<uint8_t>& data, const char separator);
   static std::string byte_array_to_hex_string(const uint8_t* data, const size_t length, const char separator);
 };

components/panasonic_heatpump/panasonic_heatpump.cpp

@@ -25,51 +25,75 @@ void PanasonicHeatpumpComponent::dump_config() {
 
 void PanasonicHeatpumpComponent::setup() {
   ESP_LOGCONFIG(TAG, "Setting up Panasonic Heatpump ...");
-  delay(10);  // NOLINT
   this->check_uart_settings(9600, 1, uart::UART_CONFIG_PARITY_EVEN, 8);
 
-  this->update();
+  this->response_queue_handle_ = xQueueCreate(8, sizeof(std::vector<uint8_t>*));
+  if (this->response_queue_handle_ == nullptr) {
+    ESP_LOGE(TAG, "Failed to create response queue!");
+    this->mark_failed();
+    return;
+  }
+  this->request_queue_handle_ = xQueueCreate(8, sizeof(std::vector<uint8_t>*));
+  if (this->request_queue_handle_ == nullptr) {
+    ESP_LOGE(TAG, "Failed to create request queue!");
+    this->mark_failed();
+    return;
+  }
+
+  // Start task
+  xTaskCreatePinnedToCore(PanasonicHeatpumpComponent::uart_task, "uart_handler", 4096, this,
+                          tskIDLE_PRIORITY + 1,  // Low priority, important for single-core C3
+                          &this->uart_task_handle_,
+                          tskNO_AFFINITY  // important for single-core C3
+  );
+  if (this->uart_client_ != nullptr) {
+    xTaskCreatePinnedToCore(PanasonicHeatpumpComponent::uart_client_task, "uart_client_handler", 4096, this,
+                            tskIDLE_PRIORITY + 1,  // Low priority, important for single-core C3
+                            &this->uart_client_task_handle_,
+                            tskNO_AFFINITY  // important for single-core C3
+    );
+  }
+
+  if (this->uart_client_ != nullptr && this->uart_client_timeout_ < 100) {
+    ESP_LOGI(TAG, "Self polling disabled (uart_client_timeout_ < 100ms). Not sending initial request.");
+    return;
+  }
 }
 
 void PanasonicHeatpumpComponent::update() {
-  if (this->uart_client_ != nullptr)
+  // Do not send polling requests if a uart client (CZ-TAW1) is configured and timeout is set too low.
+  if (this->uart_client_ != nullptr && this->uart_client_timeout_ < 100)
     return;
-  this->next_request_ = this->send_extra_request_ ? RequestType::POLLING_EXTRA : RequestType::POLLING;
+
+  // If a uart client (CZ-TAW1) is configured, check if the last request from the client is too long ago.
+  // If so, send polling request to heatpump again.
+  if (this->uart_client_ != nullptr && !this->uart_client_timeout_exceeded_) {
+    if (millis() - this->last_client_request_time_ > uart_client_timeout_)
+      this->uart_client_timeout_exceeded_ = true;
+    else
+      return;
+  }
+
+  ESP_LOGD(TAG, "Queue polling request");
+  this->queue_request(build_message(PanasonicCommand::PollingMessage));
 }
 
 void PanasonicHeatpumpComponent::loop() {
-  // Check if no request was sent for uart_client_timeout when uart_client is configured
-  if (this->uart_client_ != nullptr && this->uart_client_timeout_ > 100) {
-    uint32_t current_time = millis();
-    if (current_time - this->last_request_time_ >= this->uart_client_timeout_) {
-      this->next_request_ = RequestType::POLLING;
-      this->uart_client_timeout_exceeded_ = true;
-    }
-  }
-
   switch (this->loop_state_) {
-  case LoopState::READ_RESPONSE:
+  case LoopState::READ_RESPONSE: {
-    this->read_response();
+    switch (this->read_response()) {
-    this->loop_state_ = LoopState::CHECK_RESPONSE;
-    break;
-  case LoopState::CHECK_RESPONSE:
-    this->current_response_ = this->check_response(this->response_message_);
-    switch (this->current_response_) {
-    case ResponseType::UNKNOWN:
-      this->response_message_.clear();
-      this->loop_state_ = LoopState::SEND_REQUEST;
-      break;
-    case ResponseType::RECEIVING:
-      this->loop_state_ = LoopState::SEND_REQUEST;
-      break;
     case ResponseType::STANDARD:
       this->loop_state_ = LoopState::PUBLISH_SENSOR;
       break;
     case ResponseType::EXTRA:
       this->loop_state_ = LoopState::PUBLISH_EXTRA_SENSOR;
       break;
+    default:
+      this->loop_state_ = LoopState::SEND_REQUEST;
+      break;
     };
     break;
+  }
   case LoopState::PUBLISH_SENSOR:
     for (auto* entity : this->sensors_) {
       entity->publish_new_state(this->heatpump_default_message_);
@@ -125,233 +149,226 @@ void PanasonicHeatpumpComponent::loop() {
     this->loop_state_ = LoopState::SEND_REQUEST;
     break;
   case LoopState::SEND_REQUEST:
-    this->send_request(this->next_request_);
+    this->send_request();
-    this->loop_state_ = LoopState::READ_REQUEST;
+    // fallthrough
-    break;
-  case LoopState::READ_REQUEST:
-    this->read_request();
-    this->loop_state_ = LoopState::RESTART_LOOP;
-    break;
   default:
     this->loop_state_ = LoopState::READ_RESPONSE;
     break;
   };
 }
 
-void PanasonicHeatpumpComponent::read_response() {
+void PanasonicHeatpumpComponent::uart_task(void* pvParameters) {
-  while (this->available()) {
+  auto* self = static_cast<PanasonicHeatpumpComponent*>(pvParameters);
-    // Read each byte from heatpump and forward it directly to the client (CZ-TAW1)
+  std::vector<uint8_t> rx_buffer;
-    this->read_byte(&byte_);
+  rx_buffer.reserve(256);
-    if (this->uart_client_ != nullptr) {
+
-      this->uart_client_->write_byte(byte_);
+  while (true) {
+    // Process the data from the UART interface connected to the heatpump
+    if (self->receive_from_uart(self->parent_, rx_buffer)) {
+      auto* message = new std::vector<uint8_t>(rx_buffer);
+      if (xQueueSend(self->response_queue_handle_, &message, 0) != pdPASS) {
+        ESP_LOGW(TAG, "Response queue full or unavailable, dropping message");
+        delete message;
       }
+      // ... and pass on a copy to CZ-TAW1
+      if (self->uart_client_ != nullptr) {
+        self->uart_client_->write_array(rx_buffer);
+      }
+    } else {
+      vTaskDelay(pdMS_TO_TICKS(10));
+    }
+  }
+}
+
+void PanasonicHeatpumpComponent::uart_client_task(void* pvParameters) {
+  auto* self = static_cast<PanasonicHeatpumpComponent*>(pvParameters);
+  std::vector<uint8_t> rx_buffer;
+  rx_buffer.reserve(256);
+
+  while (true) {
+    // Process the data from the UART interface connected to the client (CZ-TAW1)
+    if (self->receive_from_uart(self->uart_client_, rx_buffer)) {
+      auto* message = new std::vector<uint8_t>(rx_buffer);
+      if (xQueueSend(self->request_queue_handle_, &message, 0) != pdPASS) {
+        ESP_LOGW(TAG, "Request queue full or unavailable, dropping message");
+        delete message;
+      }
+      self->last_client_request_time_ = millis();
+      self->uart_client_timeout_exceeded_ = false;
+    } else {
+      vTaskDelay(pdMS_TO_TICKS(10));
+    }
+  }
+}
+
+// Used for both uart interfaces
+bool PanasonicHeatpumpComponent::receive_from_uart(uart::UARTComponent* uartComp, std::vector<uint8_t>& buffer) {
+  uint8_t start_byte;
+
+  // Wait for the start byte to be available
+  while (!uartComp->available())
+    vTaskDelay(pdMS_TO_TICKS(5));
+
+  // Read the first byte
+  if (!uartComp->read_byte(&start_byte))
+    return false;
 
   // Message shall start with 0x31, 0x71 or 0xF1, if not skip this byte
-    if (!this->response_receiving_) {
+  if (start_byte != 0x31 && start_byte != 0x71 && start_byte != 0xF1) {
-      if (byte_ != 0x31 && byte_ != 0x71 && byte_ != 0xF1)
+    ESP_LOGW(TAG, "Invalid start byte: 0x%x", start_byte);
-        continue;
+    return false;
-      this->response_message_.clear();
-      this->response_receiving_ = true;
-    }
-    // Add current byte to message buffer
-    this->response_message_.push_back(byte_);
-
-    // 2. byte contains the payload size
-    if (this->response_message_.size() == 2) {
-      this->payload_length_ = byte_;
-    }
-    // 3. byte shall be 0x01 or 0x10
-    if (this->response_message_.size() == 3 && byte_ != 0x01 && byte_ != 0x10) {
-      this->response_receiving_ = false;
-      ESP_LOGW(TAG, "Invalid response message: 0x%s. Expected last byte to be 0x01 or 0x10",
-               PanasonicHelpers::byte_array_to_hex_string(this->response_message_, ',').c_str());
-      delay(10);  // NOLINT
-      continue;
-    }
-    // 4. byte shall be 0x01, 0x10 or 0x21
-    if (this->response_message_.size() == 4 && byte_ != 0x01 && byte_ != 0x10 && byte_ != 0x21) {
-      this->response_receiving_ = false;
-      ESP_LOGW(TAG, "Invalid response message: 0x%s. Expected last byte to be 0x01, 0x10 or 0x21",
-               PanasonicHelpers::byte_array_to_hex_string(this->response_message_, ',').c_str());
-      delay(10);  // NOLINT
-      continue;
   }
 
-    // Check if message is complete
+  // Prepare buffer for header reading.
-    if (this->response_message_.size() > 2 && this->response_message_.size() == this->payload_length_ + 3) {
+  // Header is 4 bytes long and first byte is already read.
-      this->response_receiving_ = false;
+  // Message may be up to 256 bytes long,
-      this->current_response_count_++;
+  // so reserve enough space to avoid dynamic resizing during reading.
-      if (this->log_uart_msg_)
+  buffer.clear();
-        PanasonicHelpers::log_uart_hex(UART_LOG_RX, this->response_message_, ',');
+  buffer.reserve(256);
-    }
+  buffer.resize(HEADER_SIZE);
+  buffer[0] = start_byte;
+
+  // Wait for header
+  if (uartComp->available() < HEADER_SIZE - 1)
+    vTaskDelay(pdMS_TO_TICKS(5));
+  // Write header to buffer
+  auto succeed = uartComp->read_array(&buffer[1], HEADER_SIZE - 1);
+
+  // Verify header (start byte, message type and length)
+  if (!verify_message_header(buffer, succeed))
+    return false;
+
+  // Calculate total message length
+  size_t total_expected = buffer[1] + 3;
+  size_t remaining = total_expected - buffer.size();
+  // Write rest of the message to buffer
+  while (remaining > 0) {
+    size_t current_size = buffer.size();
+    size_t to_read = std::min((size_t)8, remaining);
+    buffer.resize(current_size + to_read);
+    if (uartComp->available() < to_read)
+      vTaskDelay(pdMS_TO_TICKS(10));
+    if (!uartComp->read_array(&buffer[current_size], to_read)) {
+      ESP_LOGW(TAG, "Timeout while reading message body");
+      return false;
     }
+    remaining -= to_read;
   }
 
-void PanasonicHeatpumpComponent::send_request(RequestType requestType) {
+  // Verify checksum
-  switch (requestType) {
+  if (!verify_message_checksum(buffer)) {
-  case RequestType::COMMAND:
+    return false;
-    if (this->log_uart_msg_)
-      PanasonicHelpers::log_uart_hex(UART_LOG_TX, this->command_message_, ',');
-    this->write_array(this->command_message_);
-    this->flush();
-    break;
-  case RequestType::INITIAL:
-    // Probably not necessary but CZ-TAW1 sends this query on boot
-    if (this->log_uart_msg_)
-      PanasonicHelpers::log_uart_hex(UART_LOG_TX, PanasonicCommand::InitialRequest, INIT_REQUEST_SIZE, ',');
-    this->write_array(PanasonicCommand::InitialRequest, INIT_REQUEST_SIZE);
-    this->flush();
-    break;
-  case RequestType::POLLING:
-    if (this->log_uart_msg_)
-      PanasonicHelpers::log_uart_hex(UART_LOG_TX, PanasonicCommand::PollingMessage, DATA_MESSAGE_SIZE, ',');
-    this->write_array(PanasonicCommand::PollingMessage, DATA_MESSAGE_SIZE);
-    this->flush();
-    break;
-  case RequestType::POLLING_EXTRA:
-    if (this->log_uart_msg_)
-      PanasonicHelpers::log_uart_hex(UART_LOG_TX, PanasonicCommand::PollingExtraMessage, DATA_MESSAGE_SIZE, ',');
-    this->write_array(PanasonicCommand::PollingExtraMessage, DATA_MESSAGE_SIZE);
-    this->flush();
-    break;
-  };
-
-  if (requestType != RequestType::NONE && requestType != RequestType::INITIAL) {
-    // Update last request time when request was sent
-    this->last_request_time_ = millis();
   }
 
-  this->next_request_ = RequestType::NONE;
+  // Message is complete
+  return true;
 }
 
-void PanasonicHeatpumpComponent::read_request() {
+bool PanasonicHeatpumpComponent::verify_message_header(const std::vector<uint8_t>& message, bool reading_succeeded) {
-  if (this->uart_client_ == nullptr)
+  if (!reading_succeeded) {
-    return;
+    ESP_LOGW(TAG, "Timeout while reading message header");
-
+    return false;
-  while (this->uart_client_->available()) {
-    // Read each byte from client and forward it directly to the heatpump
-    this->uart_client_->read_byte(&byte_);
-    this->write_byte(byte_);
-
-    // Message shall start with 0x31, 0x71 or 0xF1, if not skip this byte
-    if (!this->request_receiving_) {
-      if (byte_ != 0x31 && byte_ != 0x71 && byte_ != 0xF1)
-        continue;
-      this->request_message_.clear();
-      this->request_receiving_ = true;
-    }
-    // Add current byte to message buffer
-    this->request_message_.push_back(byte_);
-
-    // 2. byte contains the payload size
-    if (this->request_message_.size() == 2) {
-      this->payload_length_ = byte_;
-    }
-    // 3. byte shall be 0x01 or 0x10
-    if (this->request_message_.size() == 3 && byte_ != 0x01 && byte_ != 0x10) {
-      this->request_receiving_ = false;
-      ESP_LOGW(TAG, "Invalid request message: 0x%s. Expected last byte to be 0x01 or 0x10",
-               PanasonicHelpers::byte_array_to_hex_string(this->request_message_, ',').c_str());
-      delay(10);  // NOLINT
-      continue;
-    }
-    // 4. byte shall be 0x01, 0x10 or 0x21
-    if (this->request_message_.size() == 4 && byte_ != 0x01 && byte_ != 0x10 && byte_ != 0x21) {
-      this->request_receiving_ = false;
-      ESP_LOGW(TAG, "Invalid request message: 0x%s. Expected last byte to be 0x01, 0x10 or 0x21",
-               PanasonicHelpers::byte_array_to_hex_string(this->request_message_, ',').c_str());
-      delay(10);  // NOLINT
-      continue;
   }
 
-    // Check if message is complete
+  if (message.size() < HEADER_SIZE) {
-    if (this->request_message_.size() > 2 && this->request_message_.size() == this->payload_length_ + 3) {
+    ESP_LOGW(TAG, "Message too short to contain valid header");
-      this->request_receiving_ = false;
+    return false;
-      if (this->log_uart_msg_)
-        PanasonicHelpers::log_uart_hex(UART_LOG_TX, this->request_message_, ',');
-
-      if (this->request_message_[0] != 0x31) {
-        // Update last request time when request is complete
-        this->last_request_time_ = millis();
-        this->uart_client_timeout_exceeded_ = false;
-      }
-    }
-  }
   }
 
-int PanasonicHeatpumpComponent::getResponseByte(const int index) {
+  if ((message[2] != 0x01 && message[2] != 0x10) ||                        // 3. byte shall be 0x01 or 0x10
-  if (this->heatpump_default_message_.size() > index)
+      (message[3] != 0x01 && message[3] != 0x10 && message[3] != 0x21)) {  // 4. byte shall be 0x01, 0x10 or 0x21
-    return this->heatpump_default_message_[index];
+    ESP_LOGW(TAG, "Invalid message header: 0x%s. Drop message.",
-  return -1;
+             PanasonicHelpers::byte_array_to_hex_string(message, ',').c_str());
+    return false;
   }
 
-int PanasonicHeatpumpComponent::getExtraResponseByte(const int index) {
+  return true;
-  if (this->heatpump_extra_message_.size() > index)
-    return this->heatpump_extra_message_[index];
-  return -1;
 }
 
-ResponseType PanasonicHeatpumpComponent::check_response(const std::vector<uint8_t>& data) {
+bool PanasonicHeatpumpComponent::verify_message_checksum(const std::vector<uint8_t>& message) {
+  uint8_t checksum = 0;
+  for (const auto b : message)
+    checksum += b;
+
+  // Last byte contains chechsum.
+  // Only if the sum of all bytes & 0xFF is 0, the message is valid.
+  if (checksum != 0) {
+    ESP_LOGW(TAG, "Invalid message checksum: 0x%02X. Last byte: 0x%02X", checksum, message.back());
+    return false;
+  }
+  return true;
+}
+
+ResponseType PanasonicHeatpumpComponent::read_response() {
+  std::vector<uint8_t>* message{nullptr};
+  if (xQueueReceive(this->response_queue_handle_, &message, 0) != pdPASS || message == nullptr) {
+    return ResponseType::UNKNOWN;
+  }
+  PanasonicHelpers::write_uart_log(UART_LOG_RX, *message, ',', this->log_uart_msg_);
+
+  if (!this->check_response_length(*message)) {
+    delete message;
+    return ResponseType::UNKNOWN;
+  }
+
+  // Get response type and save the response
+  auto responseType = ResponseType::UNKNOWN;
+  const uint8_t type = (*message)[3];
+  if (type == 0x10) {
+    responseType = ResponseType::STANDARD;
+    this->heatpump_default_message_ = std::move(*message);
+
+    // Is an extra request required?
+    if (this->heatpump_default_message_.size() > 199 && this->heatpump_default_message_[199] > 0x02) {
+      ESP_LOGD(TAG, "Queue extra polling request");
+      this->queue_request(build_message(PanasonicCommand::PollingExtraMessage));
+    }
+  } else if (type == 0x21) {
+    responseType = ResponseType::EXTRA;
+    this->heatpump_extra_message_ = std::move(*message);
+  } else {
+    ESP_LOGW(TAG, "Unknown response type in byte 3: 0x%02X", type);
+    responseType = ResponseType::UNKNOWN;
+  }
+
+  delete message;
+  return responseType;
+}
+
+bool PanasonicHeatpumpComponent::check_response_length(const std::vector<uint8_t>& message) {
   // Read response message:
   // format:          0x71 [payload_length] 0x01 [0x10 || 0x21] [[TOP0 - TOP114] ...] 0x00 [checksum]
   // payload_length:  payload_length + 3 = packet_length
   // checksum:        if (sum(all bytes) & 0xFF == 0) ==> valid packet
+  if (message.size() == RESPONSE_MSG_SIZE)
+    return true;
 
-  if (data.empty())
+  ESP_LOGW(TAG, "Response message too short: received %u - expected %u", message.size(), RESPONSE_MSG_SIZE);
-    return ResponseType::UNKNOWN;
+  return false;
-  if (data[0] != 0x71)
-    return ResponseType::UNKNOWN;
-  if (this->response_receiving_)
-    return ResponseType::RECEIVING;
-  if (data.size() != RESPONSE_MSG_SIZE) {
-    ESP_LOGW(TAG, "Invalid response message length: recieved %d - expected %d", data.size(), RESPONSE_MSG_SIZE);
-    delay(10);  // NOLINT
-    return ResponseType::UNKNOWN;
 }
 
-  // Verify checksum
+void PanasonicHeatpumpComponent::send_request() {
-  uint8_t checksum = 0;
+  if (millis() - request_send_time_ < REQUEST_SEND_INTERVAL) {
-  for (int i = 0; i < data.size(); i++) {
+    // wait until the interval is over
-    checksum += data[i];
+    return;
-  }
-  // all bytes (including checksum byte) shall be 0x00
-  if (checksum != 0) {
-    ESP_LOGW(TAG, "Invalid response message: checksum = 0x%02X, last_byte = 0x%02X", checksum, data[202]);
-    delay(10);  // NOLINT
-    return ResponseType::UNKNOWN;
   }
 
-  this->send_extra_request_ = data[3] == 0x10 && data[199] > 0x02 && this->send_extra_request_ == false ? true : false;
+  // Get message from queue
-
+  std::vector<uint8_t>* message{nullptr};
-  // Get response type and save the response
+  if (xQueueReceive(this->request_queue_handle_, &message, 0) != pdPASS || message == nullptr) {
-  auto responseType = ResponseType::UNKNOWN;
+    return;  // nothing queued
-  if (data[3] == 0x10) {
-    responseType = ResponseType::STANDARD;
-    this->heatpump_default_message_ = data;
-  } else if (data[3] == 0x21) {
-    responseType = ResponseType::EXTRA;
-    this->heatpump_extra_message_ = data;
-  }
-  if (responseType == ResponseType::UNKNOWN) {
-    ESP_LOGW(TAG, "Unknown response type (4. byte): 0x%02X. Expected 0x10 or 0x21.", data[3]);
-    delay(10);  // NOLINT
-    return responseType;
   }
+  PanasonicHelpers::write_uart_log(UART_LOG_TX, *message, ',', this->log_uart_msg_);
 
-  // Check if the current response is a new response
+  // Send vector content over UART (robust API usage)
-  if (this->last_response_count_ == this->current_response_count_)
+  this->write_array(message->data(), message->size());
-    return ResponseType::UNKNOWN;
+  delete message;
-  this->last_response_count_ = this->current_response_count_;
+  request_send_time_ = millis();
-
-  return responseType;
 }
 
 void PanasonicHeatpumpComponent::set_command_high_nibble(const uint8_t value, const uint8_t index) {
-  if (this->next_request_ != RequestType::COMMAND) {
+  this->command_message_ = build_message(PanasonicCommand::CommandMessage);
-    // initialize the command
+
-    this->command_message_.assign(std::begin(PanasonicCommand::CommandMessage),
-                                  std::end(PanasonicCommand::CommandMessage));
-  }
   uint8_t lowNibble = this->heatpump_default_message_[index] & 0b1111;
   uint8_t highNibble = value << 4;
   // set command byte
@@ -360,16 +377,13 @@ void PanasonicHeatpumpComponent::set_command_high_nibble(const uint8_t value, co
   this->command_message_.back() =
       PanasonicCommand::calcChecksum(this->command_message_, this->command_message_.size() - 1);
 
-  // command will be send on next loop
+  ESP_LOGD(TAG, "Queue command request");
-  this->next_request_ = RequestType::COMMAND;
+  this->queue_request(this->command_message_);
 }
 
 void PanasonicHeatpumpComponent::set_command_low_nibble(const uint8_t value, const uint8_t index) {
-  if (this->next_request_ != RequestType::COMMAND) {
+  this->command_message_ = build_message(PanasonicCommand::CommandMessage);
-    // initialize the command
+
-    this->command_message_.assign(std::begin(PanasonicCommand::CommandMessage),
-                                  std::end(PanasonicCommand::CommandMessage));
-  }
   uint8_t highNibble = this->heatpump_default_message_[index] & 0b11110000;
   uint8_t lowNibble = value & 0b1111;
   // set command byte
@@ -378,32 +392,25 @@ void PanasonicHeatpumpComponent::set_command_low_nibble(const uint8_t value, con
   this->command_message_.back() =
       PanasonicCommand::calcChecksum(this->command_message_, this->command_message_.size() - 1);
 
-  // command will be send on next loop
+  ESP_LOGD(TAG, "Queue command request");
-  this->next_request_ = RequestType::COMMAND;
+  this->queue_request(this->command_message_);
 }
 
 void PanasonicHeatpumpComponent::set_command_byte(const uint8_t value, const uint8_t index) {
-  if (this->next_request_ != RequestType::COMMAND) {
+  this->command_message_ = build_message(PanasonicCommand::CommandMessage);
-    // initialize the command
+
-    this->command_message_.assign(std::begin(PanasonicCommand::CommandMessage),
-                                  std::end(PanasonicCommand::CommandMessage));
-  }
   // set command byte
   this->command_message_[index] = value;
   // calculate and set set checksum (last element)
   this->command_message_.back() =
       PanasonicCommand::calcChecksum(this->command_message_, this->command_message_.size() - 1);
 
-  // command will be send on next loop
+  ESP_LOGD(TAG, "Queue command request");
-  this->next_request_ = RequestType::COMMAND;
+  this->queue_request(this->command_message_);
 }
 
 void PanasonicHeatpumpComponent::set_command_curve(const uint8_t value, const uint8_t index) {
-  if (this->next_request_ != RequestType::COMMAND) {
+  this->command_message_ = build_message(PanasonicCommand::CommandMessage);
-    // initialize the command
-    this->command_message_.assign(std::begin(PanasonicCommand::CommandMessage),
-                                  std::end(PanasonicCommand::CommandMessage));
-  }
 
   // Set zone 1 curve bytes
   if (index == 75 || index == 76 || index == 77 || index == 78 || index == 86 || index == 87 || index == 88 ||
@@ -436,8 +443,32 @@ void PanasonicHeatpumpComponent::set_command_curve(const uint8_t value, const ui
   this->command_message_.back() =
       PanasonicCommand::calcChecksum(this->command_message_, this->command_message_.size() - 1);
 
-  // command will be send on next loop
+  ESP_LOGD(TAG, "Queue command request");
-  this->next_request_ = RequestType::COMMAND;
+  this->queue_request(this->command_message_);
+}
+
+void PanasonicHeatpumpComponent::queue_request(const std::vector<uint8_t>& message) {
+  auto* cmd = new std::vector<uint8_t>(message);
+
+  // Check request_queue_handle_, function is called before setup() initializes it!
+  if (this->request_queue_handle_ == nullptr || xQueueSend(this->request_queue_handle_, &cmd, 0) != pdPASS) {
+    ESP_LOGW(TAG, "Request queue full or unavailable, dropping message");
+    delete cmd;
+  }
+}
+
+// This function can be used in esphome lambda to get a specific byte
+int PanasonicHeatpumpComponent::get_response_byte(const int index) {
+  if (this->heatpump_default_message_.size() > index)
+    return this->heatpump_default_message_[index];
+  return -1;
+}
+
+// This function can be used in esphome lambda to get a specific byte
+int PanasonicHeatpumpComponent::get_extra_response_byte(const int index) {
+  if (this->heatpump_extra_message_.size() > index)
+    return this->heatpump_extra_message_[index];
+  return -1;
 }
 }  // namespace panasonic_heatpump
 }  // namespace esphome

components/panasonic_heatpump/panasonic_heatpump.h

@@ -23,7 +23,6 @@ namespace esphome {
 namespace panasonic_heatpump {
 enum LoopState : uint8_t {
   READ_RESPONSE,
-  CHECK_RESPONSE,
   PUBLISH_SENSOR,
   PUBLISH_BINARY_SENSOR,
   PUBLISH_TEXT_SENSOR,
@@ -34,7 +33,6 @@ enum LoopState : uint8_t {
   PUBLISH_WATER_HEATER,
   PUBLISH_EXTRA_SENSOR,
   SEND_REQUEST,
-  READ_REQUEST,
   RESTART_LOOP,
 };
 
@@ -48,7 +46,6 @@ enum RequestType : uint8_t {
 
 enum ResponseType : uint8_t {
   UNKNOWN,
-  RECEIVING,
   STANDARD,
   EXTRA,
 };
@@ -86,9 +83,9 @@ class PanasonicHeatpumpComponent : public PollingComponent, public uart::UARTDev
   void set_log_uart_msg(bool active) {
     this->log_uart_msg_ = active;
   }
-  // uart message variables to use in lambda functions
+  // functions to use in esphome lambda
-  int getResponseByte(const int index);
+  int get_response_byte(const int index);
-  int getExtraResponseByte(const int index);
+  int get_extra_response_byte(const int index);
   // command functions
   void set_command_high_nibble(const uint8_t value, const uint8_t index);
   void set_command_low_nibble(const uint8_t value, const uint8_t index);
@@ -128,27 +125,25 @@ class PanasonicHeatpumpComponent : public PollingComponent, public uart::UARTDev
 
  protected:
   // options variables
-  uart::UARTComponent* uart_client_{nullptr};
   bool log_uart_msg_{false};
-  uint32_t last_request_time_{0};
+  uint32_t last_client_request_time_{0};
-  uint32_t uart_client_timeout_{10000};
+  uint32_t uart_client_timeout_{10000};  // 10 sec
-  // uart message variables
+  uint32_t request_send_time_{5000};  // 5 sec --> default is 5 sec so first request is not sent too fast after startup
+  static const uint32_t REQUEST_SEND_INTERVAL{250};  // 250 ms
+  static const size_t HEADER_SIZE = 4;
+
+  // uart message variables, process in main loop
+  TaskHandle_t uart_task_handle_{nullptr};
+  TaskHandle_t uart_client_task_handle_{nullptr};
+  QueueHandle_t response_queue_handle_{nullptr};
+  QueueHandle_t request_queue_handle_{nullptr};
+  uart::UARTComponent* uart_client_{nullptr};
   std::vector<uint8_t> heatpump_default_message_;
   std::vector<uint8_t> heatpump_extra_message_;
-  std::vector<uint8_t> response_message_;
-  std::vector<uint8_t> request_message_;
   std::vector<uint8_t> command_message_;
-  uint8_t payload_length_;
-  uint8_t byte_;
-  uint8_t current_response_count_{0};
-  uint8_t last_response_count_{0};
-  bool response_receiving_{false};
-  bool request_receiving_{false};
-  bool send_extra_request_{false};
   bool uart_client_timeout_exceeded_{false};
   LoopState loop_state_{LoopState::RESTART_LOOP};
-  RequestType next_request_{RequestType::INITIAL};
+
-  ResponseType current_response_{ResponseType::UNKNOWN};
   // entity vectors
   std::vector<PanasonicHeatpumpEntity*> binary_sensors_;
   std::vector<PanasonicHeatpumpEntity*> climates_;
@@ -161,10 +156,21 @@ class PanasonicHeatpumpComponent : public PollingComponent, public uart::UARTDev
   std::vector<PanasonicHeatpumpEntity*> extra_sensors_;
 
   // uart message functions
-  void read_response();
+  static void uart_task(void* pvParameters);
-  void send_request(RequestType requestType);
+  static void uart_client_task(void* pvParameters);
-  void read_request();
+  bool receive_from_uart(uart::UARTComponent* src, std::vector<uint8_t>& buffer);
-  ResponseType check_response(const std::vector<uint8_t>& data);
+
+  void send_request();
+  void queue_request(const std::vector<uint8_t>& message);
+  ResponseType read_response();
+  static bool check_response_length(const std::vector<uint8_t>& message);
+  static bool verify_message_header(const std::vector<uint8_t>& message, bool reading_succeeded);
+  static bool verify_message_checksum(const std::vector<uint8_t>& message);
+
+  template <size_t N>
+  static std::vector<uint8_t> build_message(const uint8_t (&msg)[N]) {
+    return std::vector<uint8_t>(msg, msg + N);
+  }
 };
 }  // namespace panasonic_heatpump
 }  // namespace esphome

components/panasonic_heatpump/water_heater/panasonic_heatpump_water_heater.cpp

@@ -23,7 +23,7 @@ water_heater::WaterHeaterTraits PanasonicHeatpumpWaterHeater::traits() {
 
 void PanasonicHeatpumpWaterHeater::control(const water_heater::WaterHeaterCall& call) {
   if (call.get_mode().has_value()) {
-    int byte6 = this->parent_->getResponseByte(6);
+    int byte6 = this->parent_->get_response_byte(6);
     if (byte6 >= 0) {
       water_heater::WaterHeaterMode new_mode = *call.get_mode();
       uint8_t newByte6 = this->setWaterHeaterMode(new_mode, (uint8_t)byte6);

tests/README.md

@@ -11,7 +11,6 @@ tests/
 │   ├── README.md
 │   ├── test_panasonic_heatpump_unit.py              # Unit tests
 │   ├── test_panasonic_heatpump_integration.py       # Integration tests
-│   ├── test_panasonic_heatpump_esp8266.yaml         # ESP8266 test config
 │   ├── test_panasonic_heatpump_esp32s2.yaml         # ESP32-S2 test config
 │   ├── test_panasonic_heatpump_esp32c3.yaml         # ESP32-C3 test config
 │   ├── test_panasonic_heatpump_cztaw1.yaml          # CZ-TAW1 test config

tests/panasonic_heatpump/README.md

@@ -14,13 +14,11 @@ This directory contains comprehensive tests for the `panasonic_heatpump` ESPHome
 ### Integration Tests (`test_panasonic_heatpump_integration.py`)
 - Tests minimal feature configuration on ESP32 board
 - Tests full feature configuration on ESP32 board
-- Tests configuration on ESP8266 board
 - Tests configuration on ESP32-S2 board
 - Tests configuration on ESP32-C3 board
 - Tests configuration with CZ-TAW1 (UART-proxy)
 
 ### Test Configuration Files
-- `test_panasonic_heatpump_esp8266.yaml` - ESP8266 Wemos D1 Mini
 - `test_panasonic_heatpump_esp32s2.yaml` - ESP32-S2 Wemos S2 Mini
 - `test_panasonic_heatpump_esp32c3.yaml` - ESP32-C3 mini (RISC-V)
 - `test_panasonic_heatpump_cztaw1.yaml` - UART proxy setup for CZ-TAW1 client support
@@ -68,7 +66,7 @@ The GitHub Actions workflow (`.github/workflows/test_panasonic_heatpump.yml`) in
 ### Jobs
 
 1. **test-build**: Validates and compiles the component
-   - Tests on multiple board types: ESP8266, ESP32 (full), ESP32-S2, ESP32-C3 and with CZ-TAW1 (UART-proxy)
+   - Tests on multiple board types: ESP32 (full), ESP32-S2, ESP32-C3 and with CZ-TAW1 (UART-proxy)
    - Uses esphome/build-action for firmware compilation
 
 2. **lint-code**: Runs clang-format on C++ code
@@ -196,7 +194,7 @@ All tests must pass before merging to main branch. The GitHub Actions workflow e
 - Code follows formatting standards
 - All unit and integration tests pass
 - Latest ESPHome versions is supported
-- ESP8266 and ESP32 boards are supported
+- Only ESP32 boards are supported
 
 ## Contributing
 

tests/panasonic_heatpump/test_panasonic_heatpump_esp8266.yaml

@@ -1,81 +0,0 @@
----
-# Test configuration for panasonic_heatpump component on ESP8266
-# ESP8266 has limited GPIO pins and only one UART
-
-esp8266:
-  board: d1_mini
-
-esphome:
-  name: test-panasonic-heatpump-esp8266
-  friendly_name: "Test Panasonic Heatpump ESP8266"
-
-logger:
-  level: DEBUG
-
-external_components:
-  - source:
-      type: local
-      path: ../../components
-    components: [panasonic_heatpump]
-
-uart:
-  - id: uart_heatpump
-    tx_pin: GPIO13
-    rx_pin: GPIO15
-    baud_rate: 9600
-    data_bits: 8
-    parity: EVEN
-    stop_bits: 1
-
-# Test basic configuration
-panasonic_heatpump:
-  id: my_heatpump
-  uart_id: uart_heatpump
-
-# Test sensor types - first item only
-sensor:
-  - platform: panasonic_heatpump
-    top1:
-      name: "Pump Flow"
-
-# Test binary sensors - first item only
-binary_sensor:
-  - platform: panasonic_heatpump
-    top0:
-      name: "Heatpump State"
-
-# Test text sensors - first item only
-text_sensor:
-  - platform: panasonic_heatpump
-    top4:
-      name: "Operating Mode State"
-
-# Test number controls - first item only
-number:
-  - platform: panasonic_heatpump
-    set5:
-      name: "Set Z1 Heat Request Temperature"
-
-# Test select controls - first item only
-select:
-  - platform: panasonic_heatpump
-    set2:
-      name: "Set Holiday Mode"
-
-# Test switch controls - first item only
-switch:
-  - platform: panasonic_heatpump
-    set1:
-      name: "Set Heatpump"
-
-# Test climate controls - first item only
-climate:
-  - platform: panasonic_heatpump
-    zone1:
-      name: "Zone 1"
-
-# Test water_heater controls - first item only
-water_heater:
-  - platform: panasonic_heatpump
-    tank:
-      name: "DHW"

tests/panasonic_heatpump/test_panasonic_heatpump_integration.py

@@ -12,17 +12,6 @@ import os
 class TestPanasonicHeatpumpIntegration:
     """Integration tests using ESPHome CLI."""
 
-    @pytest.fixture
-    def test_yaml_esp8266(self):
-        """Get the path to the ESP8266 test YAML file."""
-        base_dir = os.path.dirname(os.path.dirname(os.path.dirname(__file__)))
-        return os.path.join(
-            base_dir,
-            "tests",
-            "panasonic_heatpump",
-            "test_panasonic_heatpump_esp8266.yaml",
-        )
-
     @pytest.fixture
     def test_yaml_esp32(self):
         """Get the path to the ESP32 test YAML file."""
@@ -64,26 +53,6 @@ class TestPanasonicHeatpumpIntegration:
             "test_panasonic_heatpump_cztaw1.yaml",
         )
 
-    def test_validate_esp8266_config(self, test_yaml_esp8266: str):
-        """Test that the ESP8266 configuration is valid."""
-        if not os.path.exists(test_yaml_esp8266):
-            pytest.skip(f"Test file not found: {test_yaml_esp8266}")
-
-        try:
-            result = subprocess.run(
-                ["esphome", "config", test_yaml_esp8266],
-                capture_output=True,
-                text=True,
-                timeout=120,
-            )
-            assert (
-                result.returncode == 0
-            ), f"ESP8266 config validation failed: {result.stderr}"
-        except FileNotFoundError:
-            pytest.skip("ESPHome not installed")
-        except subprocess.TimeoutExpired:
-            pytest.fail("ESPHome config validation timed out")
-
     def test_validate_esp32_config(self, test_yaml_esp32: str):
         """Test that the ESP32 configuration is valid."""
         if not os.path.exists(test_yaml_esp32):