Created
February 3, 2018 05:06
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CNC.js pendant Python example
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# inspired by cncjs-pendant-raspi-gpio: https://github.com/cncjs/cncjs-pendant-raspi-gpio | |
# This CNC.js pendant opens a connection to the CNC.js web server, opens a serial port connection, | |
# writes a command, then terminates. | |
import jwt | |
import logging | |
from socketIO_client import SocketIO, LoggingNamespace | |
SERVER_ADDRESS = "localhost" | |
SERVER_PORT = 8000 | |
SERIAL_PORT = "ENTER_SERIAL_PORT_HERE" # e.g. /dev/ttyACM0 | |
SERIAL_BAUDRATE = 115200 | |
SECRET = "ENTER_SECRET_HERE" # obtained from ~/.cncrc (home directory of user that runs CNC.js) | |
USER_ID = "ENTER_USER_ID_HERE" # obtained from ~/.cncrc | |
USER_NAME = "ENTER_USERNAME_HERE" | |
CONTROLLER_TYPE = "Grbl" | |
COMMAND = "$H" # run homing cycle | |
access_token = jwt.encode({'id': USER_ID, 'name': USER_NAME}, SECRET, algorithm='HS256') | |
access_token_url_string = "token={}".format(access_token.decode('utf-8')) | |
logging.getLogger('requests').setLevel(logging.DEBUG) | |
logging.basicConfig(level=logging.DEBUG) | |
def on_connect(*args): | |
print('connect') | |
socketIO.emit('open', SERIAL_PORT, {'baudrate': SERIAL_BAUDRATE, 'controllerType': CONTROLLER_TYPE}) | |
socketIO.on('serialport:open', on_serial_port_open) | |
def on_serial_port_open(*args): | |
print('serialport:open') | |
socketIO.emit('write', SERIAL_PORT, "{};\n".format(COMMAND)) | |
socketIO.on('serialport:write', on_serial_port_write) | |
def on_serial_port_write(*args): | |
print("serialport:write") | |
global loop | |
loop = False | |
loop = True | |
with SocketIO(SERVER_ADDRESS, SERVER_PORT, LoggingNamespace, params={'token': access_token}) as socketIO: | |
socketIO.on('connect', on_connect) | |
while loop: | |
socketIO.wait(seconds=WAIT_DURATION) |
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