MQTT Initial Implementation

[ahmadshahwan]

No description provided.

[drem-darios]

👍 Are you working on a Java based MQTT impl? If so I can contribute to that fork.

[ahmadshahwan]

Hello Drem, indeed we have Java implementation in mind, but no much work has been done in this direction yet. So you're most welcome to kick it off.
A generic "how to implement a new protocol for Herald" is available on the wiki. It's more meant for Python (I wrote it while implementing MQTT in Python) but it should give good indications for Java as well.

[drem-darios]

Great! I'll see if I get something working in my spare time. I'm assuming there will need to be other work done in a different cohorte project to get configuration working. Are you working on the mqtt configuration for python?

[ahmadshahwan]

Ideally, Herald is designed to allow "pluggable" new transports (such as HTTP, XMPP, MQTT) without even the need to change other files (including those of the same project).
In Java, and using OSGi, it boils down to implementing (and providing) two services:

• org.cohorte.herald.ITransport, and
• org.cohorte.herald.ITransportDirectory.

Unfortunately, in my commits on this branch I "mistakenly" did some changes that are not related to the MQTT implementation (fixing a minor bug, reformatting code). Relevant changes are only files added under the python/herald/transports/mqtt/ directory.