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Keep mqtt connection open, avoid 0s on start #19

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Keep mqtt connection open, avoid 0s on start #19

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20 changes: 12 additions & 8 deletions docker/mqtt.sh
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Original file line number Diff line number Diff line change
Expand Up @@ -109,15 +109,19 @@ for entity in $CLEANUP_ENTITIES; do
-t "$DISCOVERY_TOPIC" -n -r
done

# Periodic state updates
# mosquitto_pub -l keeps the connection open and publishes each line of input, outer loop
# reconnects on drop, use keep-alive larger than MQTT_PAUSE to avoid needless pings.
while true; do
# Replace this with your real data source
ORB_OUTPUT="$(/app/orb summary || echo '{}')"
#echo "ORB_OUTPUT: $ORB_OUTPUT"
while true; do
# sleep first to avoid publishing zeroes on first iteration
sleep "$MQTT_PAUSE"

# Publish Orb Summary to MQTT
mosquitto_pub -h "$MQTT_HOST" -p "$MQTT_PORT" -u "$MQTT_USER" -P "$MQTT_PASS" \
-t "$STATE_TOPIC" -m "$ORB_OUTPUT" -r
# output a single line to mosquitto_pub
(/app/orb summary || echo '{}') | jq -c .

done | mosquitto_pub -h "$MQTT_HOST" -p "$MQTT_PORT" -u "$MQTT_USER" -P "$MQTT_PASS" \
-t "$STATE_TOPIC" -l -r -k $((MQTT_PAUSE * 2))

sleep "$MQTT_PAUSE"
echo "mosquitto_pub disconnected, reconnecting..."
done