[21:15:27.482] ========================================
[21:15:27.482] MCU OTA Upgrader v2
[21:15:27.482]   bin=/data/local/tmp/mcu_app.bin
[21:15:27.482]   project=10040
[21:15:27.482]   port=/dev/ttyS7 @ 460800 8N1
[21:15:27.482] ========================================
[21:15:27.487] [BIN] size=215904 CRC16=0x3E61
[21:15:27.487] 三步握手...
[TX] Setup FF AA 00 07 01 01 F6 
[21:15:30.619] [WARN] 三步握手超时(attempt 1/3)
[TX] Setup FF AA 00 07 01 01 F6 
[21:15:33.638] [WARN] 三步握手超时(attempt 2/3)
[TX] Setup FF AA 00 07 01 01 F6 
[21:15:36.660] [WARN] 三步握手超时(attempt 3/3)
[21:15:36.660] [ERR] [FAIL] 三步握手失败
[21:15:36.660] [ERR] === 操作失败 ===