Following on from the security update of 1.2.3, some further changes are introduced to make the communication path between NQPTP and Shairport Sync resistant to outside interference. On Linux, nqptp now runs as a restricted user but with special permission to access ports 319 and 320.
These changes have necessitated changing the SMI interface. The SMI interface is now at version 10, and Shairport Sync must also be updated to be compatible with it.
Before updating, it is important that you remove the startup service file as described in the README.
Please read the Release Notes for more details.