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import paho.mqtt.client as mqtt
import json
import os
import logging
import signal
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from datetime import datetime
from influxdb import InfluxDBClient
from dotenv import find_dotenv, load_dotenv
load_dotenv(find_dotenv())
SRC_MQTT_HOST = os.getenv("SRC_MQTT_HOST")
SRC_MQTT_USER = os.getenv("SRC_MQTT_USER")
SRC_MQTT_PASS = os.getenv("SRC_MQTT_PASS")
DST_MQTT_HOST = os.getenv("DST_MQTT_HOST")
DST_MQTT_USER = os.getenv("DST_MQTT_USER")
DST_MQTT_PASS = os.getenv("DST_MQTT_PASS")
DST_INFLUX_HOST = os.getenv("DST_INFLUX_HOST")
DST_INFLUX_USER = os.getenv("DST_INFLUX_USER")
DST_INFLUX_PASS = os.getenv("DST_INFLUX_PASS")
DST_INFLUX_DB = os.getenv("DST_INFLUX_DB")
OT_TOPIC="owntracks/tobru/dragino"
OT_TID="dragino"
def on_connect_ttn(client, userdata, flags, rc):
logging.info("connected to ttn %s - %s", SRC_MQTT_HOST, str(rc))
client.subscribe("+/devices/+/up")
def on_connect_ot(client, userdata, flags, rc):
logging.info("connected to ot %s - %s", DST_MQTT_HOST, str(rc))
def on_publish_ot(client, userdata, rc):
logging.info("published data to ot")
def on_log(client, userdata, level, buf):
logging_level = mqtt.LOGGING_LEVEL[level]
logging.log(logging_level, buf)
logging.info("got a log message level %s: %s", str(userdata), level, str(buf))
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# The callback for when a PUBLISH message is received from the server.
def on_message_ttn(client, userdata, msg):
data = json.loads(msg.payload)
logging.info("message from ttn received for %s - #%s", data["dev_id"], data["counter"])
logging.info("received via gw %s", data["metadata"]["gateways"][0]["gtw_id"])
if "latitude" in data["payload_fields"]:
# max is 4 volts, 3 volts is considered empty
batpercent = round((data["payload_fields"]["batV"] - 3) * 100)
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# transform received data into OwnTracks format
ot_data = json.dumps({
"_type": "location",
"lat": data["payload_fields"]["latitude"],
"lon": data["payload_fields"]["longitude"],
"batt": batpercent,
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"t": "p",
"tid": OT_TID,
"tst": int(datetime.timestamp(datetime.now())),
"conn": "m",
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})
# publish to owntracks
logging.info("publishing data to owntracks")
client_ot.publish(OT_TOPIC,ot_data)
# write to influxdb
logging.info("writing data to influxdb")
influxdb.write_points(
[
{
"measurement": "dragino",
"tags": {
"device": "lgt92",
},
"fields": {
"bat": data["payload_fields"]["batV"],
"pitch": data["payload_fields"]["pitch"],
"roll": data["payload_fields"]["roll"],
"lat": data["payload_fields"]["latitude"],
"lon": data["payload_fields"]["longitude"],
"alarm": int(data["payload_fields"]["alarm"]),
"counter": data["counter"],
"airtime": data["metadata"]["airtime"],
"rssi": data["metadata"]["gateways"][0]["rssi"],
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}
}
]
)
else:
logging.info("no GPS data present - skipping")
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logging.info("data processing done")
def shutdown():
logging.info("disconnecting from mqtt")
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client_ot.disconnect()
client_ot.loop_stop()
client_ttn.disconnect()
client_ttn.loop_stop()
def handleSIGTERM(signalNumber, frame):
logging.info("got SIGTERM")
shutdown()
return
if __name__ == '__main__':
signal.signal(signal.SIGTERM, handleSIGTERM)
logging.basicConfig(
level=logging.INFO,
format='%(asctime)s - %(message)s',
datefmt='%Y-%m-%d %H:%M:%S %Z'
)
# Prepare InfluxDB
influxdb = InfluxDBClient(
host=DST_INFLUX_HOST,
port=443,
database=DST_INFLUX_DB,
username=DST_INFLUX_USER,
password=DST_INFLUX_PASS,
ssl=True,
verify_ssl=True,
)
# Prepare MQTT
client_ttn = mqtt.Client()
client_ttn.enable_logger()
client_ttn.on_connect = on_connect_ttn
client_ttn.on_message = on_message_ttn
client_ttn.on_log = on_log
client_ttn.username_pw_set(SRC_MQTT_USER,SRC_MQTT_PASS)
client_ttn.tls_set()
client_ttn.connect(SRC_MQTT_HOST, 8883, 60)
client_ot = mqtt.Client()
client_ot.enable_logger()
client_ot.on_connect = on_connect_ot
client_ot.on_publish = on_publish_ot
client_ot.on_log = on_log
client_ot.username_pw_set(DST_MQTT_USER,DST_MQTT_PASS)
client_ot.tls_set()
client_ot.connect(DST_MQTT_HOST, 8883, 60)
try:
# Connect to MQTT and react to messages
client_ot.loop_start()
client_ttn.loop_forever()
except KeyboardInterrupt:
shutdown()
logging.info("tschuess")