Yes that would be a great idea, basically I would suggest to implement something via monolog and fallback to "echo" - so it would basically be a composer-suggests/recommends instead of requirement.

Ok this might be a little more complicated:

• the reason I implemented (rather shitty) the "log" method is so I can output each byte as soon as it arrives - this is so I can really see everything until to the point of a crash
• implementing a logger means I would have to call the logger after I received all bytes (which might not work on a crash) and to make it have more sense it would have to add some useful information, like "what command was actually being made" - "what was the actual received xml data"

So conclusion:

• logger will be a config option (psr-log interface)
• it is independent of the current debug
• it will additionally log the Frame class name that was sent

We used to log also the command type (the Frame class in this case) so the whole conclusion sounds perfect.