feat(gateway): add support for KNX TP UART 9-bit mode and enhance UART pin configuration

Signed-off-by: Tony <tonylu@tony-cloud.com>

components/openknx_idf/src/ets_device_runtime.cpp

@@ -80,6 +80,7 @@ EtsDeviceRuntime::EtsDeviceRuntime(std::string nvs_namespace,
                               ? tunnel_client_address
                               : DefaultTunnelClientAddress(
                                     device_.deviceObject().individualAddress()));
+    server->deviceAddressPropertiesTargetClient(false);
     server->tunnelFrameCallback(&EtsDeviceRuntime::EmitTunnelFrame, this);
   }
   device_.functionPropertyCallback(&EtsDeviceRuntime::HandleFunctionPropertyCommand);

components/openknx_idf/src/tpuart_uart_interface.cpp

@@ -1,6 +1,7 @@
 #include "openknx_idf/tpuart_uart_interface.h"
 
 #include "esp_log.h"
+#include "soc/uart_periph.h"
 
 #include <utility>
 
@@ -9,15 +10,39 @@ namespace {
 
 constexpr const char* kTag = "openknx_tpuart";
 
+bool ResolveUartIoPin(uart_port_t uart_port, int configured_pin, uint32_t pin_index,
+                      int* resolved_pin) {
+  if (resolved_pin == nullptr) {
+    return false;
+  }
+  if (configured_pin >= 0) {
+    *resolved_pin = configured_pin;
+    return true;
+  }
+  if (uart_port < 0 || uart_port >= SOC_UART_NUM || pin_index >= SOC_UART_PINS_COUNT) {
+    *resolved_pin = UART_PIN_NO_CHANGE;
+    return false;
+  }
+  const int default_pin = uart_periph_signal[uart_port].pins[pin_index].default_gpio;
+  if (default_pin < 0) {
+    *resolved_pin = UART_PIN_NO_CHANGE;
+    return false;
+  }
+  *resolved_pin = default_pin;
+  return true;
+}
+
 }  // namespace
 
 TpuartUartInterface::TpuartUartInterface(uart_port_t uart_port, int tx_pin, int rx_pin,
-                                         size_t rx_buffer_size, size_t tx_buffer_size)
+                                         size_t rx_buffer_size, size_t tx_buffer_size,
+                                         bool nine_bit_mode)
     : uart_port_(uart_port),
       tx_pin_(tx_pin),
       rx_pin_(rx_pin),
       rx_buffer_size_(rx_buffer_size),
-      tx_buffer_size_(tx_buffer_size) {}
+      tx_buffer_size_(tx_buffer_size),
+      nine_bit_mode_(nine_bit_mode) {}
 
 TpuartUartInterface::~TpuartUartInterface() { end(); }
 
@@ -29,22 +54,30 @@ void TpuartUartInterface::begin(int baud) {
   uart_config_t config{};
   config.baud_rate = baud;
   config.data_bits = UART_DATA_8_BITS;
-  config.parity = UART_PARITY_EVEN;
+  config.parity = nine_bit_mode_ ? UART_PARITY_EVEN : UART_PARITY_DISABLE;
   config.stop_bits = UART_STOP_BITS_1;
   config.flow_ctrl = UART_HW_FLOWCTRL_DISABLE;
   config.source_clk = UART_SCLK_DEFAULT;
 
+  int tx_pin = UART_PIN_NO_CHANGE;
+  int rx_pin = UART_PIN_NO_CHANGE;
+  if (!ResolveUartIoPin(uart_port_, tx_pin_, SOC_UART_TX_PIN_IDX, &tx_pin) ||
+      !ResolveUartIoPin(uart_port_, rx_pin_, SOC_UART_RX_PIN_IDX, &rx_pin)) {
+    ESP_LOGE(kTag, "UART%d has no ESP-IDF default TX/RX pin; configure explicit pins",
+             uart_port_);
+    return;
+  }
+
   esp_err_t err = uart_param_config(uart_port_, &config);
   if (err != ESP_OK) {
     ESP_LOGE(kTag, "failed to configure UART%d: %s", uart_port_, esp_err_to_name(err));
     return;
   }
 
-  err = uart_set_pin(uart_port_, tx_pin_ < 0 ? UART_PIN_NO_CHANGE : tx_pin_,
-                     rx_pin_ < 0 ? UART_PIN_NO_CHANGE : rx_pin_, UART_PIN_NO_CHANGE,
-                     UART_PIN_NO_CHANGE);
+  err = uart_set_pin(uart_port_, tx_pin, rx_pin, UART_PIN_NO_CHANGE, UART_PIN_NO_CHANGE);
   if (err != ESP_OK) {
-    ESP_LOGE(kTag, "failed to route UART%d pins: %s", uart_port_, esp_err_to_name(err));
+    ESP_LOGE(kTag, "failed to route UART%d pins tx=%d rx=%d: %s", uart_port_, tx_pin,
+             rx_pin, esp_err_to_name(err));
     return;
   }