Last active
August 29, 2015 14:04
-
-
Save caetanus/54a9b95de7ad1212f640 to your computer and use it in GitHub Desktop.
LPR server
This file contains bidirectional Unicode text that may be interpreted or compiled differently than what appears below. To review, open the file in an editor that reveals hidden Unicode characters.
Learn more about bidirectional Unicode characters
| #!/usr/bin/env python2.7 | |
| """ | |
| LPR server for remote control to serial port via network supporting auto discover of the server. | |
| """ | |
| import serial | |
| import socket | |
| import select | |
| import logging | |
| logging.basicConfig(format='%(levelname)s:%(message)s', level=logging.DEBUG) | |
| class LPR(object): | |
| _s_con = None | |
| _conn = socket.socket() | |
| _udp_sock = socket.socket(socket.AF_INET, socket.SOCK_DGRAM) | |
| _listen = socket.socket() | |
| def __init__(self): | |
| self._udp_sock.setsockopt(socket.SOL_SOCKET, socket.SO_BROADCAST, True) | |
| self._udp_sock.bind(("0.0.0.0", 1235)) | |
| self._listen.bind(("0.0.0.0", 9100)) | |
| self._listen.listen(1) | |
| def open(self): | |
| self._conn.close() | |
| self._conn, addr = self._listen.accept() | |
| if self._s_con: | |
| self._s_con.close() | |
| self._s_con = serial.Serial(1, 115200, 8, 'N', 1, None, xonxoff=True, rtscts=False) | |
| logging.info("new connection from %s", addr) | |
| def write(self): | |
| out = [] | |
| while select.select([self._conn], [], [], 0)[0]: | |
| out.append(self._conn.recv(4096)) | |
| data = ''.join(out) | |
| if not data: | |
| logging.warning("broken pipe") | |
| self._s_con.write(data) | |
| logging.info("writing %d bytes into serial", len(data)) | |
| def main(self): | |
| evts = select.select([self._udp_sock, self._listen, self._conn], [], [])[0] | |
| if self._udp_sock in evts: | |
| data, addr = self._udp_sock.recvfrom(2048) | |
| logging.info("sending address to addr %s", addr[0]) | |
| self._udp_sock.sendto("ok", addr) | |
| return | |
| if self._listen in evts: | |
| self.open() | |
| return | |
| if self._conn in evts: | |
| self.write() | |
| if __name__ == '__main__': | |
| logging.info("starting daemon") | |
| lpr = LPR() | |
| while True: lpr.main() |
Sign up for free
to join this conversation on GitHub.
Already have an account?
Sign in to comment