from __future__ import print_function '''SerialTransport implements wire transport over serial port.''' # Local serial port loopback: socat PTY,link=COM8 PTY,link=COM9 from select import select import serial from .transport import Transport class SerialTransport(Transport): def __init__(self, device, *args, **kwargs): self.serial = None super(SerialTransport, self).__init__(device, *args, **kwargs) def _open(self): self.serial = serial.Serial(self.device, 115200, timeout=10, writeTimeout=10) def _close(self): self.serial.close() self.serial = None def ready_to_read(self): rlist, _, _ = select([self.serial], [], [], 0) return len(rlist) > 0 def _write(self, msg, protobuf_msg): try: self.serial.write(msg) self.serial.flush() except serial.SerialException: print("Error while writing to socket") raise def _read(self): try: (msg_type, datalen) = self._read_headers(self.serial) return (msg_type, self.serial.read(datalen)) except serial.SerialException: print("Failed to read from device") raise