Binary Protocol

[0xA5][0x5A]           Magic sync (2 bytes)
  [VER]                  Version (1 byte) - currently 1
  [TYPE]                 Message type (1 byte)
                         1 = request, 2 = response_ok, 3 = response_err
  [FLAGS]                Bitfield (1 byte) - usually 0
  [LEN_HI][LEN_LO]       Payload length, big-endian (2 bytes)
  [PAYLOAD...]           Command data (variable)
  [CKSUM_HI][CKSUM_LO]   Checksum - sum of VER+TYPE+FLAGS+LEN+PAYLOAD

import serial
  from app.utils.device_serial.byte_protocol import encode_frame, TYPE_REQUEST
  from app.utils.device_serial.command_codec import encode_request

  # Open serial to Pico
  ser = serial.Serial('/dev/ttyACM0', 115200, timeout=1)

  # Build PING command
  payload = encode_request({'method': 'ping'})
  frame = encode_frame(TYPE_REQUEST, payload)

  print(f"Sending PING: {frame.hex()}")
  ser.write(frame)

  # Read response
  response = ser.read(100)
  print(f"Response: {response.hex()}")

  ser.close()

import serial
  from app.utils.device_serial.byte_protocol import encode_frame, TYPE_REQUEST
  from app.utils.device_serial.command_codec import encode_request
  import time

  ser = serial.Serial('/dev/ttyACM0', 115200, timeout=1)

  # Send BOOTLOADER command
  payload = encode_request({'method': 'reboot.bootloader'})
  frame = encode_frame(TYPE_REQUEST, payload)

  print(f"Sending BOOTLOADER: {frame.hex()}")
  ser.write(frame)

  # Device will disconnect/reboot (no response expected)
  time.sleep(1)

  # Check if RPI-RP2 mount appears
  import os
  time.sleep(2)
  bootsel_mounts = [d for d in os.listdir('/media/user') if 'RPI' in d.upper()]
  if bootsel_mounts:
      print(f"✅ BOOTSEL successful! Mount: {bootsel_mounts[0]}")
  else:
      print("❌ No BOOTSEL mount detected")

  ser.close()