Due to S2 now being more commonly used, and there being confusion about how the config difference between the S1 vs S2, which results in confusion when issues are raised, I've decided to make S1 disabled by default.
Users that wish to use S1 simply need to set the following env var and things should work as they did before:
BNB_SONOS_ENABLE_S1=true
apologies for any breaks.