Annotation-based state machine definition for doubly nested switch-case implementations

• goals: testability, documentation
• assumptions: fixed code stucture
• input: some code (.c)
• output: graphviz state machine ...
• documentation: BTstack Wiki page
• implementation: Python
• problems:
  • implicit event like "can send packet now", =? deal with guards?
  • "inverse handler" for "global" events

Example:

// @STATEMACHINE(multiplexer)
switch (multiplexer->state) {       // detect state variable, count {
    case W4_MULTIPLEXER:            // implicit state
        switch (event) {            // events start here
            case  L2CAP_OPEN:       // implicit event
                // @ACTION(action description)
                multiplexer->state = OTHER_STATE;
                break;              // break || return -> end case block
        }
        break;
    case OTHER_STATE:
        break;
    }
}