85 lines
2.5 KiB
Python
85 lines
2.5 KiB
Python
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#!/usr/bin/python2
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# -*- coding: utf8 -*-
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# Get data from MQTT broker and print them to
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# Papirus ePaper display
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from papirus import Papirus
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from papirus import PapirusTextPos
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import paho.mqtt.client as mqtt
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import datetime
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import decimal
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# MQTT settings
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mqtt_server = 'localhost'
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mqtt_port= 1883
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mqtt_auth= {'username':'cameteo',
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'password':'CaMeteo'}
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mqtt_client_id= 'mqtt2papirus'
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topic="pi/papirus_zero_hat/temperature/#"
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# Papirus display settings
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disp_rotation = 0
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font_path = '/usr/share/fonts/truetype/freefont/FreeMono.ttf'
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font_path_bold = '/usr/share/fonts/truetype/freefont/FreeMonoBold.ttf'
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text_size = 15
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date = datetime.datetime.now().replace(microsecond=0).isoformat()
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temp = "-"
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unit_temp = "\u00B0C"
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#Set the dispaly and position of text
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text = PapirusTextPos(False, rotation=disp_rotation)
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#text.Clear()
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text.AddText(date, 0, 0, text_size, Id="Date", font_path=font_path_bold)
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text.AddText("Connecting to MQTT...", 5, 15, text_size, Id="Temperature", font_path=font_path)
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text.WriteAll()
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# The callback for when the client receives a CONNACK response from the server.
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def on_connect(client, userdata, flags, rc):
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print("Connected with result code "+str(rc))
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date = datetime.datetime.now().replace(microsecond=0).isoformat()
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text.UpdateText("Date", date, font_path=font_path_bold)
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text.UpdateText("Temperature", "Connected to MQTT !")
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text.WriteAll()
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# Subscribing in on_connect() means that if we lose the connection and
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# reconnect then subscriptions will be renewed.
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client.unsubscribe("$SYS/#")
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client.subscribe(topic)
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# The callback for when a PUBLISH message is received from the server.
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def on_message(client, userdata, msg):
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global unit_temp
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top=msg.topic[len(topic)-1:].strip()
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print(top+" : "+str(msg.payload))
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if top == "date" :
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text.UpdateText("Date", msg.payload, font_path=font_path_bold)
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if top == "unit" :
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unit_temp = msg.payload
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if top == "value" :
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val = decimal.Decimal(msg.payload)
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txt = "T= %.1f" % val + unit_temp.decode("utf-8")
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text.UpdateText("Temperature", txt)
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text.WriteAll()
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########
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# Main #
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########
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#Connect to MQTT broker and loop...
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mqtt_client = mqtt.Client(mqtt_client_id, clean_session=False)
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mqtt_client.username_pw_set(mqtt_auth['username'], mqtt_auth['password'])
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mqtt_client.on_connect = on_connect
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mqtt_client.on_message = on_message
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mqtt_client.connect(mqtt_server, mqtt_port, 60)
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mqtt_client.loop_forever()
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