global_listener.py

#!/usr/bin/env python3
#
# This is a NetworkTables client (eg, the DriverStation/coprocessor side).
# You need to tell it the IP address of the NetworkTables server (the
# robot or simulator).
#
# This shows how to use a listener to listen for all changes in NetworkTables
# values, which prints out all changes. Note that the keys are full paths, and
# not just individual key values.
#

import sys
import time
from networktables import NetworkTables

# To see messages from networktables, you must setup logging
import logging
logging.basicConfig(level=logging.DEBUG)

if len(sys.argv) != 2:
    print("Error: specify an IP to connect to!")
    exit(0)

ip = sys.argv[1]

NetworkTables.initialize(server=ip)

def valueChanged(key, value, isNew):
    print("valueChanged: key: '%s'; value: %s; isNew: %s" % (key, value, isNew))

NetworkTables.addGlobalListener(valueChanged)

while True:
    time.sleep(1)