The Trydan ESP32 WiFi stack saturates under nymea's periodic ICMP pings
(observed: latency > 14 s, Modbus timeouts, charger drops off).
Changes:
- NetworkDeviceMonitor removed entirely from setupThing() and thingRemoved().
The charger is expected to have a DHCP-reserved IP (documented in code).
Address comes from trydanThingAddressParamTypeId param — already the correct
path after the previous setup fix.
- Connectivity now derives from Modbus poll success/failure only (reachable()
from TrydanModbusTcpMaster), NOT from network ping. A ping response does
not imply Modbus usability on this hardware.
- postSetupThing() timer (30 s): if not reachable, calls connectDevice() for
reconnect; if reachable, calls update(). The 30 s period IS the backoff —
no aggressive retry loop.
- Modbus timeout: 2 s → 5 s (tolerates residual WiFi latency spikes).
- Modbus retries per read: 1 → 0 (abort fast on first timeout; full poll
sequence already aborts at first error via doNextRead).
- k_errorLimit: 5 → 3 (3 × 5 s = 15 s before marking unreachable).
- New state "statusMessage" (QString): set on disconnect with timestamp +
cause ("timeout Modbus — vérifier signal WiFi de la borne"); cleared on
successful poll. Visible in nymea-app; helps SAV without SSH access.
- "networkdevice" removed from JSON interfaces (contract broken without monitor).
Invariants preserved: Big/Big float32 decode, no block read, PauseState+Lock
mirror, PauseDynamic conflict management, writeCompleted address filtering.
Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>
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