Change in signature protocol?

[tomkxy]

Was there a change in the signature protocol recently?

I am getting a "Unsupported signing presentation version (0)!" message. I am still running a gateway from 1.5 master branch which used to work with an older version of the development branch.

Before I going the effort now to upgrade my old MQTTClientGateway including updating all the Openhab bindings I just want to make sure this is necessary.