Module mqtt.connector.nginx
Nginx OpenResty co-sockets based connector.
This connector works with the non-blocking openresty sockets. Note that the secure setting haven't been implemented yet. It will simply use defaults when doing a TLS handshake.
Caveats:
* sockets cannot cross phase/context boundaries. So all client interaction must be done from the timer context in which the client threads run.
* multiple threads cannot send simultaneously (simple scenarios will just work)
* since the client creates a long lived connection for reading, it returns upon receiving a packet, to call an event handler. The handler must return swiftly, since while the handler runs the socket will not be reading. Any task that might take longer than a few milliseconds should be off loaded to another thread.
* Nginx timers should be short lived because memory is only released after the context is destroyed. In this case we're using them for prolonged periods of time, so be aware of this and implement client restarts if required.
thanks to @irimiab: https://github.com/xHasKx/luamqtt/issues/13