Setting a custom MQTT keep-alive interval using thin-edge.io and mosquitto

TEDGE_CUSTOM_MQTT_KEEPALIVE.md

Set custom MQTT keep-alive value

Warning: If you run tedge reconnect c8y or tedge connect c8y, you will need to re-edit the c8y-bridge.conf file again (as it is auto generated). thin-edge.io will be added support to configure this value, but it hasn't been implemented yet, see issues/3153.

1. Stop all thin-edge.io related services

   tedge disconnect c8y
   systemctl stop tedge-agent

2. Update settings (to minimize data traffic)

   tedge config set c8y.availability.interval 360m

   Alternatively you could turn off the availability monitoring (though you won't get the nice green-icon in Cumulocity)

   tedge config set c8y.availability.enable false

3. Create the device certificate if you haven't already done so

   tedge cert create --device-id "mydevice001"

4. Configure the test tenant and upload the device's certificate

   tedge config set c8y.url "example.com"
   tedge cert upload c8y
   

5. Connect thin-edge.io (though we'll have to manually edit the bridge config afterwards)

   tedge connect c8y
   

6. Edit the generated c8y-bridge.conf file and add a manual MQTT keep-alive interval

   Open the following file in an editor:

   /etc/tedge/mosquitto-conf/c8y-bridge.conf
   

   Then append the following value under the ### Bridge section:

   keepalive_interval 3540

   Save the file.

7. Restart mosquitto

   systemctl restart mosquitto