in the use case of the clock-receptor we need two versions of the CLOCK_TELL_TIME signal in the protocol:
a short-term listen/response signal that returns the current time
a long-term listener that triggers according the either the specified semtrex on TICK (for a specific time) or on other symbols for other time specifications (see #62)
in the use case of the clock-receptor we need two versions of the CLOCK_TELL_TIME signal in the protocol: