Clarify Buffer hex string error message
Taking a clue from https://github.com/nodejs/node/blob/master/src/string_bytes.cc#L503, provide more reason for why a hex string is invalid (namely that the issue is the length being odd rather than even).
Do not update/delete: Banner broadcast message test data
Do not update/delete: Notification broadcast message test data
Taking a clue from https://github.com/nodejs/node/blob/master/src/string_bytes.cc#L503, provide more reason for why a hex string is invalid (namely that the issue is the length being odd rather than even).