Buffer size is now an input parameter only as the return data length
is implicit since a null terminated C string is returned. Better
precondition checks are impelmented.
There was an inconsistency in whether the CAT terminator character is
included in returned messages. It now follows the comment in
kenwood_transaction() i.e. strips of the terminator and returns a
message length that reflects that.
The function kenwood_cmd doesn't add value and it uses a reply buffer
that is not required. Also the use of a reply buffer disables the
verification of commands that have no reply feature. Substituted
kenwood_simple_cmd calls that do the job correctly without a reply
buffer.
Added delay to busy retry loop when sending commands to rig.
Implemented retries on wrong length repies from rig also with a delay.
Michael Black