When I had a quick look at the android app a while back I also found the insecure CoAP, but there was also a hardcoded api-key for what looked like a aws endpoint(http://uqeh6fio3g.execute-api.us-east-1.amazonaws.com/prod)

Also a really bad default passphrase(key_file.txt) which I think is used for generating some kind of key/cert.... I have not looked at the actual gateway at all yet.