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fix: send wifiStrength only for real signal changes

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At -70 dBm the RSSI moves a dBm or two constantly, so the >1 dBm check
every 1.5s sent wifiStrength to every client about 270 times an hour.
That is extra traffic on an already lossy link and a state write in
Home Assistant for each one.

Broadcast on a channel change, or for a change of at least 3 dBm no
more than every 10s. A newly connected client still gets the current
value straight away.

Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>
This commit is contained in:
cjkas 2026-10-11 20:35:42 +02:00
parent 1d1f685fce
commit 05c3d309a6
5 changed files with 44 additions and 2 deletions
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5
src/ESPNetwork.h
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@ -8,10 +8,15 @@
#define CONNECT_TIMEOUT 20000
#define SSID_SCAN_INTERVAL 600000
// A weak signal moves a dBm or two all the time, so only broadcast real
// changes and not more often than this.
#define RSSI_EMIT_MIN_DBM 3
#define RSSI_EMIT_MIN_MS 10000
class ESPNetwork {
protected:
unsigned long lastEmit = 0;
unsigned long lastMDNS = 0;
unsigned long lastRSSIEmit = 0;
int lastRSSI = 0;
int lastChannel = 0;
int linkSpeed = 0;