Hey @Ron_Katz,
Are the issues you’re facing still connecting your devices to Losant as described in this post?
As Dylan mentioned there, in the documentation for the InGateway 502, there is a screenshot for the MQTT configuration that shows a field for Client-ID.
You mentioned that I have only found one device that has a “client-id” field for MQTT, is the InGateway 502 the only device you’ve found? What other devices are you working with? There is a chance that with some more information on what other devices you are using, I can help you out.
Thank you,
Heath