fix timeout in 1200bps reset mode
fix timeout in 1200bps reset mode


Former-commit-id: 8ec512afa7f124cbaebea0997d7b1e8898743ea7 [formerly 1d103797422c624e8536a870d4836c618719276f]
Former-commit-id: 586ceaf373554f611f0f1e6a521ddddb2c2514c7
arduino/arduino-create-agent,arduino/arduino-create-agent,arduino/arduino-create-agent,arduino/arduino-create-agent