Change callbacks to be passed status and result

[emontnemery]

Breaking change

The signature of callbacks called when requests are completed has been changed:

• The callbacks must now accept a bool status and an optional dict with response
• The callbacks will be called both in case the request succeeds and when it doesn't

New callback signature:

CallbackType = Callable[[bool, dict | None], None]
"""Signature of optional callback functions supported by methods sending messages.

The callback function will be called with a bool indicating if the message was sent
and an optional response dict.
"""

Change

Callback functions are now called not only on success but also on error. This prevents failing requests from hanging forever. Also, many user facing functions which send messages to the remote device but do not accept a callback now accept a timeout parameter.

Background in PR #779

Needs #784

[MartinHjelmare]

The breaking change sentence sounds weird. It sounds like the callback is called when a request has changed signature.

[MartinHjelmare]

I think you should document what the callback parameters mean, at least in the PR description and maybe in the readme.