1) Active Sensing:
Once an ActiveSensing message is received, the system checks for timeouts: if no message is received within the specified 300ms (see in _Defs), an error is set and the checks for timeout stop.
2) added a callback for errors. 2 errors are defined: parse error and ActiveSensing timeout
From: https://www.midi.org/specifications/item/table-1-summary-of-midi-message
Active Sensing. This message is intended to be sent repeatedly to tell the receiver that a connection is alive. Use of this message is optional. When initially received, the receiver will expect to receive another Active Sensing message each 300ms (max), and if it does not then it will assume that the connection has been terminated. At termination, the receiver will turn off all voices and return to normal (non- active sensing) operation.
lathoub