robot_sim.py

#!/usr/bin/env python3
# modified from: https://github.com/robotpy/pynetworktables/blob/master/samples/nt_robot.py
#
# This is a NetworkTables server (eg, the robot or simulator side).
#
# On a real robot, you probably would create an instance of the 
# wpilib.SmartDashboard object and use that instead -- but it's really
# just a passthru to the underlying NetworkTable object.
#
# When running, this will continue incrementing the value 'robotTime',
# and the value should be visible to networktables clients such as 
# SmartDashboard. To view using the SmartDashboard, you can launch it
# like so:
#
#     SmartDashboard.jar ip 127.0.0.1
#

import time
from networktables import NetworkTable

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

sd = NetworkTable.getTable("SmartDashboard")
sd.putString("omg", "")

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

sd.addTableListener(valueChanged)

i = 0
while True:
    try:
        print('dsTime:', sd.getNumber('dsTime'))
    except KeyError:
        print('dsTime: N/A')

    sd.putNumber('robotTime', i)
    time.sleep(1)
    i += 1