I work for overlock, we're trying to build a debugging tool which specifically addresses the unique needs of distributed systems. We're really looking for early feedback and for companies who are deploying IoT systems. Happy to answer any questions!
Some questions: FAQ reads that channel from devices to Overlock employs MQTT(S). I guess that means MQTT-SN, using TLS layer for authentication. Which auth methods do you support? Do you support validation of the client and the server? Can the gateway act as such also for Overlock or do devices need to open the MQTT channel directly?
That should probably be written as secure-MQTT, I'll get that changed. So we are just using vanilla MQTT over TLS.
We're currently using token-based authentication but certainly open to supporting other options. Did you have any suggestions?
I'm not quite sure what you mean about validation? In general, the gateway will already be in communication with the end devices over whatever protocol they're using. So it makes sense to log state etc. from the gateway for those devices. In that sense, the gateway does act as a gateway for overlock.