I2C network query protocol

[trentgill]

Leaders can ping the network requesting all devices to signal their presence. The response should include:

• I2C address of the device
• Whether the device is a leader/follower/both

Main use-case is for multiple self-organizing crows (and W/s) to communicate without requiring any explicit setup in a user-script. See issue #5.

What are the other use-cases where this functionality is valuable?

This feature clearly suggests a large amount of additional work beyond crow as other modules must support the query on the global broadcast channel. That is a large number of devices now (>15?) so I hope the response-to-ping behaviour can be relatively simple, thus simple to implement.

[trentgill]

Closing this here as it should flow from decisions made by the working group at: https://github.com/monome/ii

For now, we will require address-setting & communication to be explicit for #5 .