Function decode_valid_broker_list_changed_push 

pub fn decode_valid_broker_list_changed_push(
    body: &[u8],
) -> Result<CidStatusChangePush>

Decode CMD20177 before scheduling any broker-list refresh.

C++ FTlogin/Src/ftlogin/login/logger.cpp:1959-1984 rejects malformed CidStatusChangePush; its sole reserved field is intentionally not used.