working end to end transmit, receive and code example using companion mode

examples/AutoProvision/platformio.ini

@@ -1,26 +1,26 @@
 ; Self-contained PlatformIO project for the AutoProvision example.
 ;
-; The radio region is set via build flags — the same LORA_* defines you'd use
-; when compiling MeshCore firmware. Override them here for your region.
-;
-;     cd examples/AutoProvision
-;     pio run -t upload
+; Two host boards are provided — pick one with -e:
+;     pio run -e esp32-s3-devkitc-1 -t upload   # generic ESP32-S3 dev board
+;     pio run -e xiao-esp32s3       -t upload   # Seeed XIAO ESP32-S3
 ;     pio device monitor
 ;
+; The radio region is set via build flags — the same LORA_* defines you'd use
+; when compiling MeshCore firmware. The host UART pins differ per board because
+; the XIAO does not break out GPIO17/18.
+;
 ; The library is pulled from the repo root (two levels up) via a relative
 ; symlink dependency, so there's no copy of the source.
 
-[env:esp32-s3]
+[platformio]
+default_envs = esp32-s3-devkitc-1
+
+[common]
 platform = espressif32
-board = esp32-s3-devkitc-1
 framework = arduino
 monitor_speed = 115200
 lib_deps = symlink://../..
-
 build_flags =
-    ; host UART pins to the companion
-    -D UART_RX_PIN=17
-    -D UART_TX_PIN=18
     -D UART_BAUD=115200
     ; AU narrow band radio region
     -D LORA_FREQ=916.575
@@ -28,3 +28,25 @@ build_flags =
     -D LORA_SF=7
     -D LORA_CR=8
     -D LORA_TX_POWER=20
+
+[env:esp32-s3-devkitc-1]
+extends = common
+board = esp32-s3-devkitc-1
+build_flags =
+    ${common.build_flags}
+    ; host UART pins to the companion
+    -D UART_RX_PIN=17
+    -D UART_TX_PIN=18
+
+[env:xiao-esp32s3]
+extends = common
+board = seeed_xiao_esp32s3
+build_flags =
+    ${common.build_flags}
+    ; host UART pins to the companion (XIAO pads D7=GPIO44 RX, D6=GPIO43 TX)
+    -D UART_RX_PIN=44
+    -D UART_TX_PIN=43
+    ; the XIAO has only native USB (no UART bridge) — route Serial to USB-CDC so
+    ; the monitor sees output. (The devkit doesn't need this; it has a CP2102.)
+    -D ARDUINO_USB_MODE=1
+    -D ARDUINO_USB_CDC_ON_BOOT=1

examples/AutoProvision/src/main.cpp

@@ -75,6 +75,8 @@ static void provision() {
 
 void setup() {
     Serial.begin(115200);
+    delay(1000);
+    Serial.printf("[boot] test auto provision started\n");
     Serial1.begin(UART_BAUD, SERIAL_8N1, UART_RX_PIN, UART_TX_PIN);
 
     mc.onDeviceInfo([](const mc_device_info_t& d) {