* Pause Nostr geohash firehose in background to cut mobile data
The Bluetooth mesh uses no mobile data, but the Nostr relay layer ran
unbounded in the background: the live geohash channel subscription kept
streaming across 5 relays, the presence heartbeat broadcast every ~60s,
and a participant-refresh timer polled every 30s. Combined with
reconnect/re-subscribe replay on public relays, this could burn gigabytes
while idle.
GeohashViewModel now tears down the high-volume subscriptions when the app
is backgrounded (onStop) and restores them on foreground (onStart):
- drop the live channel message stream (currentGeohashSubId)
- drop sampling subscriptions
- cancel the presence heartbeat and participant-refresh timer
Gift-wrap DM subscriptions are intentionally kept alive in the background
since they are filtered to our pubkey (lightweight) so DMs still arrive.
The selected channel is tracked in activeChannelGeohash so the stream can
be rebuilt on foreground without losing the user's selection. The channel
subscription logic is extracted into subscribeChannelStream() /
subscribeChannelDM() helpers.
Co-Authored-By: Claude Opus 4.8 <noreply@anthropic.com>
* separate the heartbeat firehose from message delivery
* correct comment
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Co-authored-by: Claude Opus 4.8 <noreply@anthropic.com>
Co-authored-by: callebtc <93376500+callebtc@users.noreply.github.com>
