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#!/usr/bin/env python
# coding=utf-8
# This file is part of the PiXtend(R) Project.
#
# For more information about PiXtend(R) and this program,
# see <https://www.pixtend.de> or <https://www.pixtend.com>
#
# Copyright (C) 2018 Robin Turner
# Qube Solutions UG (haftungsbeschränkt), Arbachtalstr. 6
# 72800 Eningen, Germany
#
# This program is free software: you can redistribute it and/or modify
# it under the terms of the GNU General Public License as published by
# the Free Software Foundation, either version 3 of the License, or
# (at your option) any later version.
#
# This program is distributed in the hope that it will be useful,
# but WITHOUT ANY WARRANTY; without even the implied warranty of
# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
# GNU General Public License for more details.
#
# You should have received a copy of the GNU General Public License
# along with this program. If not, see <http://www.gnu.org/licenses/>.
from __future__ import print_function
# Import Pixtend class
from pixtendlib import Pixtend
import paho.mqtt.client as mqtt
import time, os, urlparse, sys
# The callback for when the client receives a CONNACK response from the server.
def on_connect(client, userdata, flags, rc):
client.subscribe("/pixtend/rel0")
client.subscribe("/pixtend/rel1")
client.subscribe("/pixtend/rel2")
client.subscribe("/pixtend/rel3")
# The callback for when a PUBLISH message is received from the server.
def on_message(client, userdata, msg):
if ((len(msg.topic) == 13) and (msg.topic[:len(msg.topic)-1] == "/pixtend/rel")):
try:
relnum = int(msg.topic[-1:])
try:
value = int(msg.payload)
if (value == 0 or value == 1):
if (relnum == 0):
p.relay0 = value
elif (relnum == 1):
p.relay1 = value
elif (relnum == 2):
p.relay2 = value
elif (relnum == 3):
p.relay3 = value
except ValueError:
value = 0
except ValueError:
relnum = 0
strSlogan1 = "PiXtend Python Library (PPL) demo for MQTT."
strSlogan2 = "PiXtend Python Library (PPL) demo for MQTT finished."
# -----------------------------------------------------------------
# Print Art and Slogan
# -----------------------------------------------------------------
print("")
print(" ____ _ _ __ __ __")
print(" / __ \\ (_) | |/ / / /_ ___ ____ ____/ /")
print(" / /_/ / / / | / / __/ / _ \\ / __ \\ / __ / ")
print(" / ____/ / / / | / /_ / __/ / / / // /_/ / ")
print("/_/ /_/ /_/|_| \\__/ \\___/ /_/ /_/ \\__,_/ ")
print("")
print(strSlogan1)
print("")
# Setup MQTT Client for publish and subcribe
client = mqtt.Client()
client.on_connect = on_connect
client.on_message = on_message
client.username_pw_set(USERNAME_HERE, PASSWORD_HERE)
client.connect(SERVER_HERE, PORT_HERE, 60)
# Non-Blocking call that processes network traffic, dispatches callbacks
client.loop_start()
# -----------------------------------------------------------------
# Create instance
# -----------------------------------------------------------------
p = Pixtend()
# Open SPI bus for communication
try:
p.open()
except IOError as io_err:
# On error, print an error text and delete the Pixtend instance.
print("Error opening the SPI bus! Error is: ", io_err)
p.close()
p = None
# -----------------------------------------------------
# Main Program
# -----------------------------------------------------
if p is not None:
print("Running Main Program - Hit Ctrl + C to exit")
# Set some variables needed in the main loop
is_config = False
cycle_counter = 0
toggle_counter = 0
while True:
try:
# Using Auto Mode for optimal SPI bus usage
if p.auto_mode() == 0:
cycle_counter += 1
if not is_config:
is_config = True
print("One time configuration")
print("The value 0 = OFF and the value 1 = ON")
print("")
# Setting the relays and digital outputs with a pattern which can be toggled later.
# Side effect the LEDs on the PiXtend board alternate nicely back and forth.
p.relay0 = p.OFF
p.relay1 = p.OFF
p.relay2 = p.OFF
p.relay3 = p.OFF
# Build text with values from all digital outputs und relays
str_text = "Cycle No.: {0}\n".format(cycle_counter)
str_text += "Digital Input 0: {0}\n".format(p.digital_input0)
str_text += "Digital Input 1: {0}\n".format(p.digital_input1)
str_text += "Digital Input 2: {0}\n".format(p.digital_input2)
str_text += "Digital Input 3: {0}\n".format(p.digital_input3)
str_text += "Digital Input 4: {0}\n".format(p.digital_input4)
str_text += "Digital Input 5: {0}\n".format(p.digital_input5)
str_text += "Digital Input 6: {0}\n".format(p.digital_input6)
str_text += "Digital Input 7: {0}\n".format(p.digital_input7)
str_text += "Relay 0: {0}\n".format(p.relay0)
str_text += "Relay 1: {0}\n".format(p.relay1)
str_text += "Relay 2: {0}\n".format(p.relay2)
str_text += "Relay 3: {0}\n".format(p.relay3)
# Print text to console
print(str_text, end="\r")
# Reset cursor
for i in range(0, 13, 1):
sys.stdout.write("\x1b[A")
# MQTT processing...
if toggle_counter >= 50:
client.publish("/pixtend/digin0", p.digital_input0)
client.publish("/pixtend/digin1", p.digital_input1)
client.publish("/pixtend/digin2", p.digital_input2)
client.publish("/pixtend/digin3", p.digital_input3)
client.publish("/pixtend/digin4", p.digital_input4)
client.publish("/pixtend/digin5", p.digital_input5)
client.publish("/pixtend/digin6", p.digital_input6)
client.publish("/pixtend/digin7", p.digital_input7)
toggle_counter = 0
else:
toggle_counter += 1
else:
print("Auto Mode - Communication is not yet up...Please wait...")
# Wait at minimum 0.1sec or 100ms before getting new values
time.sleep(0.1)
except KeyboardInterrupt:
# Keyboard interrupt caught, Ctrl + C, now clean up and leave program
client.loop_stop()
client.disconnect()
client = None
p.close()
p = None
for i in range(0, 14, 1):
print("")
print(strSlogan2)
break
else:
# Close any possible MQTT connection
client.loop_stop()
client.disconnect()
client = None
p = None
# If there was an error when opening the SPI bus interface, leave the program.
print("")
print("There was a problem with the PiXtend communication. Quitting.")
print("")
print(strSlogan2)
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