fix(gateway): improve TP-UART configuration logging and handling for ETS device states

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

components/gateway_knx/src/gateway_knx.cpp

@@ -2922,17 +2922,13 @@ bool GatewayKnxTpIpRouter::configureTpUart() {
                   std::to_string(config_.tp_uart.uart_port) + " tx=" +
                   UartPinDescription(config_.tp_uart.tx_pin, tp_uart_tx_pin_) + " rx=" +
                   UartPinDescription(config_.tp_uart.rx_pin, tp_uart_rx_pin_);
-    if (ets_device_ != nullptr && !ets_device_->configured()) {
-      ESP_LOGW(kTag,
-               "%s; continuing KNXnet/IP in commissioning-only IP mode so ETS can program the "
-               "device",
-               last_error_.c_str());
-      tp_uart_port_ = -1;
-      tp_uart_online_ = false;
-      return true;
-    }
-    ESP_LOGE(kTag, "%s", last_error_.c_str());
-    return false;
+    const bool configured = ets_device_ != nullptr && ets_device_->configured();
+    ESP_LOGW(kTag,
+             "%s; continuing KNXnet/IP in %s IP mode while TP-UART stays offline",
+             last_error_.c_str(), configured ? "configured" : "commissioning-only");
+    tp_uart_port_ = -1;
+    tp_uart_online_ = false;
+    return true;
   }
   const TickType_t startup_elapsed_ticks = xTaskGetTickCount() - startup_begin_tick;
   if (startup_elapsed_ticks > 0) {