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Gated behind NB_DISABLE_WG_KEEP_ALIVE for battery measurements; unset the variable and the behaviour is unchanged. Peers start with the 25s persistent keepalive so an idle responder still emits traffic and triggers the handshake initiation, then the interval drops to zero once the watcher observes a fresh handshake. The keepalive is re-armed whenever a connection attempt restarts, so every new handshake gets initiated the same way. The watcher also stops its periodic handshake check after that first observation: with keepalive disabled an idle peer never rotates its handshake, so the periodic check would report a false disconnect every checkPeriod and trigger a full reconnect.