#145

[Yaytay]

Motivation:

Remove @GenIgnore from addConnectionEstablishedCallback

[Yaytay]

Hi @vietj,

Please can you take a look at this, is it OK to remove the @GenIgnore from addConnectionEstablishedCallback?
The aim is to make it available to the Rx users.
I'm not getting any errors, but I'm not sure that's a good indication in this case :)

If this isn't OK, is there a way to provide a Rx-compatible method that lets the caller register a method that completes asynchronously?
Either returning a Future or taking in a Handler would be fine.

Note that the connectionEstablishCallback is called multiple times independently, which prevents some options.

Thanks.