feat(ble-deployer): add CMD_RESET for Arduino DTR pulse reset

frontend/src/lib/types/deployer.ts

@@ -33,6 +33,7 @@ export const CMD_END = 0x03;
 export const CMD_ACK = 0x04;
 export const CMD_ERR = 0x05;
 export const CMD_SET_BAUD = 0x06;
+export const CMD_RESET = 0x07;
 
 export const SUPPORTED_BAUD_RATES = [9600, 19200, 38400];
 export const DEFAULT_BAUD_RATE = 9600;

velxio-deployer-firmware/main/CMakeLists.txt

@@ -9,6 +9,7 @@ idf_component_register(
         state_machine.c
         serial_bridge.c
         led_button.c
+        arduino_reset.c
     INCLUDE_DIRS
         .
 )

velxio-deployer-firmware/main/arduino_reset.c

@@ -0,0 +1,17 @@
+#include "arduino_reset.h"
+#include "usb_host.h"
+#include "esp_log.h"
+
+static const char *TAG = "ARDUINO_RESET";
+
+/**
+ * Trigger DTR pulse to reset Arduino.
+ * Delegates to the existing usb_host_reset_arduino() which drives
+ * DTR/RTS low → 1ms delay → high → 50ms delay, mirroring avrdude's
+ * Arduino autoreset sequence.
+ */
+void arduino_trigger_reset(void) {
+    ESP_LOGI(TAG, "Triggering Arduino reset via DTR pulse...");
+    usb_host_reset_arduino();
+    ESP_LOGI(TAG, "Arduino reset pulse complete");
+}

velxio-deployer-firmware/main/arduino_reset.h

@@ -0,0 +1,8 @@
+#pragma once
+
+/**
+ * Trigger hardware reset on Arduino via DTR pulse.
+ * Must be called before serial bridge starts to ensure
+ * Arduino bootloader is ready.
+ */
+void arduino_trigger_reset(void);

velxio-deployer-firmware/main/binary_parser.h

@@ -25,6 +25,7 @@
 #define CMD_ACK  0x04
 #define CMD_ERR  0x05
 #define CMD_SET_BAUD 0x06
+#define CMD_RESET   0x07
 
 /** Maximum hex binary buffer size (256 KB — fits largest Arduino sketch). */
 #define MAX_HEX_SIZE (256 * 1024)

velxio-deployer-firmware/main/ble_service.c

@@ -18,6 +18,7 @@ void ble_store_config_init(void);
 #include "state_machine.h"
 #include "services/gatt/ble_svc_gatt.h"
 #include "ble_service.h"
+#include "arduino_reset.h"
 #include "serial_bridge.h"
 #include "state_machine.h"
 #include "binary_parser.h"
@@ -91,7 +92,10 @@ static int serial_char_access_cb(uint16_t conn_handle, uint16_t attr_handle,
             os_mbuf_copydata(ctxt->om, 0, len, data);
             ESP_LOGI(TAG, "Serial write: len=%d conn=%d", len, conn_handle);
 
-            if (len == 5 && data[0] == CMD_SET_BAUD) {
+            if (len == 1 && data[0] == CMD_RESET) {
+                ESP_LOGI(TAG, "CMD_RESET: triggering Arduino reset");
+                arduino_trigger_reset();
+            } else if (len == 5 && data[0] == CMD_SET_BAUD) {
                 uint32_t baud = (uint32_t)data[1] | ((uint32_t)data[2] << 8) |
                                 ((uint32_t)data[3] << 16) | ((uint32_t)data[4] << 24);
                 ESP_LOGI(TAG, "CMD_SET_BAUD: %lu", (unsigned long)baud);