Hi,
I tried making the application and updating it on the board.
But I cannot see it in the app list on the board.
Is there something more to be done?

I noticed that when a simple legatoClient app is mqtt connected to the mqttClient and the user manually stops the legatoClient app. The next time the legatoClient app starts it fails with
"mqtt disconnected: err:1 subErr:-1"

A work around is to mqtt_Disconnect() at the start of legatoClient. I will add a SIGTERM handler to mqtt_Disconnect() which is probably a better workaround.

But maybe mqttClient could detect legatoClient closing and clean up ?

It would be useful to be able to send multiple key / values per mqtt send.
The current mqtt_Send() api function sends a single set.

Currently the mqtt user name is automatically set to the product IMEI value.

I think this is ok as a default setting but it would be good to be able to read and set this value via the api

I have found that if IP is disconnected when I call mqtt_Connect() the callback handler fails with isConnected == false. Which seems reasonable.

Later when the IP connection is connected no attempt is made by mqttClient to connect. Not sure if this is expected behaviour?

An mqtt_Status() function would be useful to check the connect / connecting status maybe to report
mqttClient_t.session.isConnected

I can see mqttClient_t* mqttMain_getClient(void); in the original IBM mqtt code. As Legato IPC doesn't support structures I think mqtt_Status() could work around this. Maybe in an ascii Key / Value to allow read access to other structure members as well?