Add Python sender for Raspberry Pi Zero

.gitignore

@@ -6,4 +6,6 @@ obj/
 .vs/
 _ReSharper.Caches/
 
-Private/
+Private/
+
+__pycache__/

DeviceStatus/Sender/.gitignore

@@ -0,0 +1 @@
+.vscode/

DeviceStatus/Sender/config.py

@@ -0,0 +1,6 @@
+from device import Device
+
+devices = []
+
+devices.append(Device("washer", 20))
+devices.append(Device("dryer", 21))

DeviceStatus/Sender/device.py

@@ -0,0 +1,6 @@
+class Device:
+    last_status = 0
+
+    def __init__(self, name, pin):
+        self.name = name
+        self.pin = pin

DeviceStatus/Sender/device_status_sender.service

@@ -0,0 +1,9 @@
+[Unit]
+Description=Device Status Server Service
+
+[Service]
+Environment=PYTHONUNBUFFERED=1
+ExecStart=/usr/bin/python /home/ckaczor/Code/Personal/HomeMonitor/DeviceStatus/Sender/sender.py
+
+[Install]
+WantedBy=default.target

DeviceStatus/Sender/sender.py

@@ -0,0 +1,73 @@
+#!/usr/bin/python
+# -*- coding: utf-8 -*-
+
+import config
+import RPi.GPIO as GPIO
+import time
+import paho.mqtt.client as mqtt
+
+from datetime import datetime as dt
+from paho.mqtt.client import connack_string as ack
+from paho.mqtt.properties import Properties
+from paho.mqtt.packettypes import PacketTypes
+
+
+def log(message=""):
+    print(dt.now().strftime("%H:%M:%S.%f")[:-2] + " " + message)
+
+
+def on_connect(client, userdata, flags, rc, v5config=None):
+    log("Connection returned result: " + ack(rc))
+
+
+def on_publish(client, userdata, mid, tmp=None):
+    log("Published message id: " + str(mid))
+
+
+log("Config:")
+
+for device in config.devices:
+    log("  pin %s: %s" % (device.pin, device.name))
+
+log()
+
+client = mqtt.Client(client_id="device_status_sender",
+                     transport="tcp",
+                     protocol=mqtt.MQTTv5)
+
+
+properties = Properties(PacketTypes.CONNECT)
+properties.SessionExpiryInterval = 30 * 60
+
+client.connect("172.23.10.3", 1883, 60,
+               clean_start=mqtt.MQTT_CLEAN_START_FIRST_ONLY, properties=properties)
+
+client.on_connect = on_connect
+client.on_publish = on_publish
+
+client.loop_start()
+
+GPIO.setmode(GPIO.BCM)
+
+for device in config.devices:
+    log("Setting up pin %s" % (device.pin))
+    GPIO.setup(device.pin, GPIO.IN, pull_up_down=GPIO.PUD_DOWN)
+
+log()
+
+while True:
+    for device in config.devices:
+        pin_status = GPIO.input(device.pin)
+
+        if pin_status != device.last_status:
+            log("pin %s: %s" % (device.pin, pin_status))
+
+            device.last_status = pin_status
+
+            info = client.publish(device.name, str(pin_status), 1)
+
+            info.wait_for_publish()
+
+    time.sleep(0.25)
+
+GPIO.cleanup()