lorawan/notify.py

import select
import psycopg2
import psycopg2.extensions
import websocket

channels = [ "loriot", "swisscom", "ttn" ]

def to_nodered(self, data):
    dev = self.devEUI(data)
    text = self.payload(data)

    ws = websocket.create_connection("ws://localhost:1880/")
    ws.send("%s" % data)
    ws.close()

def wait_for_pkg(conns):
    if select.select(conns,[],[]) == ([],[],[]):
        print("Select error")
    else:
        conn.poll()
        while conn.notifies:
            notify = conn.notifies.pop(0)
            print("Got NOTIFY: {} {} {}".format(notify.pid, notify.channel, notify.payload))

if __name__ == '__main__':
    conns = []
    for channel in channels:

        conn = psycopg2.connect("dbname=lorawan")
        conn.set_isolation_level(psycopg2.extensions.ISOLATION_LEVEL_AUTOCOMMIT)

        curs = conn.cursor()
        curs.execute("LISTEN {};".format(channel))

        conns.append(conn)
        print("Waiting for notifications on channel {}".format(channel))

    while True:
        wait_for_pkg(conns):