I've developed a MqTT server instance that running into ESP8266 with the following feature:
- Work with MqTT 3.1.1 protocol
- Manage QoS0 messages ( * first release, in future also QoS1 e 2)
- Persistent message store
- Manage subscription with both clean or non clean session
- MqTT User Authentication
More details you can find @ http://bartech.mybluemix.net/2017/07/19 ... n-esp8266/
You someone is interested to act as beta tester, please contact me.... after summer I will release code under Apahce 2.0 license agreement on github.
Bye!
Francesco Barone