80 lines
2.2 KiB
Python
80 lines
2.2 KiB
Python
# node.py
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# Simple Python client to show node activity from ttn MQTT brooker with credentials
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# Author: R.Schimmel
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# www.schimmel-bisolutions.nl
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# first install paho.mqtt.client: pip install paho-mqtt
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#
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# Enhanced for lorawan in Digital Glarus by Nico Schottelius (nico.schottelius -at- ungleich.ch)
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#
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import paho.mqtt.client as mqtt
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import psycopg2
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import json
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import base64
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import os
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#Call back functions
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# gives connection message
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def on_connect(client,userdata,rc):
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print("Connected with result code:"+str(rc))
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# subscribe for all devices of user
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client.subscribe('+/devices/+/up')
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# gives message from device
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def on_message(client,userdata,msg):
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myjson = msg.payload.decode('utf-8')
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mydict = json.loads(myjson)
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deveui = mydict['dev_eui']
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payload = base64.b64decode(mydict['payload']).decode('utf-8')
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print("{}: {}".format(deveui, payload))
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insert_json("ttn", myjson, payload, deveui)
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def on_log(client,userdata,level,buf):
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print("message:" + msg)
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print("userdata:" + str(userdata))
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def insert_json(provider, data, payload='', deveui=''):
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try:
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conn = psycopg2.connect("dbname=lorawan")
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cursor = conn.cursor()
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cursor.execute("insert into packets values (DEFAULT, DEFAULT, %s, %s, %s, %s)", (provider, data, payload, deveui))
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cursor.connection.commit()
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conn.close()
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except Exception as e:
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print("DB Insert failed: %s" % e)
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notify(payload, deveui)
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def notify(payload='', deveui=''):
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notify="{}:{}".format(deveui, payload)
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try:
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conn = psycopg2.connect("dbname=lorawan")
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cursor = conn.cursor()
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cursor.execute("select pg_notify ('lora', %s)", (notify, ))
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cursor.connection.commit()
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except Exception as e:
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print("DB Notify failed: %s" % e)
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if __name__ == '__main__':
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mqttc= mqtt.Client()
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mqttc.on_connect=on_connect
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mqttc.on_message=on_message
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print("Connecting to ttn")
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username=os.environ['ttn_user']
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password=os.environ['ttn_password']
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mqttc.username_pw_set(username, password)
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mqttc.connect("staging.thethingsnetwork.org",1883,10)
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# and listen to server
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print("Listening via mqtt")
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run = True
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while run:
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mqttc.loop()
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