From 9b710ec727a541b8e4bfebfed67540aa92897c6a Mon Sep 17 00:00:00 2001
From: Tobias Brunner <tobias@tobru.ch>
Date: Sun, 10 May 2020 21:52:01 +0200
Subject: [PATCH] lwt, location retain, better logging

---
 lgt92.py | 25 ++++++++++++++++++++-----
 1 file changed, 20 insertions(+), 5 deletions(-)

diff --git a/lgt92.py b/lgt92.py
index 87bd192..6a9a9d1 100644
--- a/lgt92.py
+++ b/lgt92.py
@@ -20,6 +20,7 @@ DST_INFLUX_USER = os.getenv("DST_INFLUX_USER")
 DST_INFLUX_PASS = os.getenv("DST_INFLUX_PASS")
 DST_INFLUX_DB = os.getenv("DST_INFLUX_DB")
 HC_PING_URL = os.getenv("HC_PING_URL")
+VERSION = "V1.1"
 
 OT_TOPIC="owntracks/tobru/dragino"
 OT_TID="dragino"
@@ -46,7 +47,15 @@ def on_log(client, userdata, level, buf):
 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"])
+
+    # retrieve info about gateway
+    gtw_id = data["metadata"]["gateways"][0]["gtw_id"]
+    gtw_info = requests.get("https://www.thethingsnetwork.org/gateway-data/gateway/"+gtw_id).json()
+    logging.info("received via gw %s, %s, owned by %s",
+        data["metadata"]["gateways"][0]["gtw_id"],
+        gtw_info[gtw_id]["description"],
+        gtw_info[gtw_id]["owner"],
+    )
 
     # max is 4 volts, 3 volts is considered empty
     batpercent = round((data["payload_fields"]["batV"] - 3) * 100)
@@ -68,8 +77,8 @@ def on_message_ttn(client, userdata, msg):
         })
 
         # publish to owntracks
-        logging.info("publishing data to owntracks topic on mqtt")
-        client_ot.publish(OT_TOPIC,ot_data)
+        logging.info("publishing data to owntracks via mqtt %s", OT_TOPIC)
+        client_ot.publish(OT_TOPIC, payload=ot_data, retain=True, qos=1)
     else:
         logging.info("no GPS data / latitude present")
         # set GPS data to 0 for InfluxDB
@@ -122,7 +131,7 @@ if __name__ == '__main__':
         datefmt='%Y-%m-%d %H:%M:%S %Z'
     )
 
-    logging.info("Starting ioteer lgt92. V1.0")
+    logging.info("Starting ioteer lgt92. "+VERSION)
 
     # Prepare InfluxDB
     influxdb = InfluxDBClient(
@@ -135,7 +144,7 @@ if __name__ == '__main__':
             verify_ssl=True,
     )
 
-    # Prepare MQTT
+    # Prepare MQTT for The Things Network
     client_ttn = mqtt.Client()
     client_ttn.enable_logger()
     client_ttn.on_connect = on_connect_ttn
@@ -145,6 +154,11 @@ if __name__ == '__main__':
     client_ttn.tls_set()
     client_ttn.connect(SRC_MQTT_HOST, 8883, 60)
 
+    # Prepare MQTT for OwnTracks
+    ot_lwt = json.dumps({
+        "_type": "lwt",
+        "tst": int(datetime.timestamp(datetime.now())),
+    })
     client_ot = mqtt.Client()
     client_ot.enable_logger()
     client_ot.on_connect = on_connect_ot
@@ -152,6 +166,7 @@ if __name__ == '__main__':
     client_ot.on_log = on_log
     client_ot.username_pw_set(DST_MQTT_USER,DST_MQTT_PASS)
     client_ot.tls_set()
+    client_ot.will_set(OT_TOPIC, payload=ot_lwt, qos=1, retain=True)
     client_ot.connect(DST_MQTT_HOST, 8883, 60)
 
     try: