SILC_FSM_CALL_CONTINUE(fsm)

    Macro used to proceed after asynchornous call.  This is called in the
    callback of the asynchronous call to continue in the state machine.

    void some_callback(void *context) {
      SilcFSM fsm = context;
      ...
      // Continue to the next state
      SILC_FSM_CALL_CONTINUE(fsm);
    }