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steinhelge a544594769 Initial project: XIAO ESP32S3 + SX1262 LoRa sensor link hytte–hjem

- cabin_node: subscribes to local MQTT (ESPHome sensors), sends
  temperature, battery voltage/SOC and switch states over LoRa SF12
- cabin_gw: receives LoRa packets, publishes JSON to home MQTT broker
- Bidirectional: gateway forwards ON/OFF commands from home HA to node
- cabin_node always in RX mode (12V powered) — commands arrive instantly
- ESPHome config for ESP32 on teknisk rom: Victron MPPT BLE + JBD BMS
  BLE + DS18B20 temperatures + GPIO switches for varme/VVB

Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>

2026-03-10 23:11:35 +01:00

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hytte_link

LoRa-basert sensorlink mellom hytte og hjemme. Sender temperatur (inne/ute), batterispenning og SOC fra 12V-anlegg på hytta til MQTT-broker hjemme (alu).

Arkitektur

Hytte:
  DS18B20 (inne/ute) ──┐
  Victron MPPT (BLE) ──┤
  JBD BMS (BLE) ────── ESP32 (ESPHome, cabin_tech) ──WiFi──► MQTT (lokal HA)
                                                               │
                        XIAO ESP32S3 + Wio-SX1262 ◄──MQTT────┘
                          (cabin_node)
                              │ LoRa SF12 868 MHz
                              ▼ 15–20 km
Hjemme:               XIAO ESP32S3 + Wio-SX1262
                          (cabin_gw)
                              │ MQTT publish
                              ▼
                        mosquitto (alu, 192.168.86.31)
                              │
                        Home Assistant hjemme

Bygging (PlatformIO)

pio run -e cabin_node              # hytte-node
pio run -e cabin_gw                # hjemme-gateway
pio run -e cabin_node -t upload
pio run -e cabin_gw -t upload

ESPHome (cabin_tech)

esphome run esphome/cabin_tech.yaml

Secrets

Kopier include/secrets.example.h → include/secrets.h og fyll inn. Kopier esphome/secrets.yaml.example → esphome/secrets.yaml og fyll inn.

LoRa-parametere

Parameter	Verdi
Frekvens	868 MHz
SF	12
BW	125 kHz
CR	4/5
Sync word	0xAB
Airtime	~1.3 s

Pakkeformat (CabinPacket, 12 bytes)

Felt	Type	Enhet
magic	uint8	0xCA
seq	uint8	rullende
temp_in_x10	int16	°C × 10
temp_out_x10	int16	°C × 10
batt_mv	uint16	mV
batt_pct	uint8	0–100
sig	uint32	HMAC-SHA256 (trunkert)

Pinner (Wio-SX1262 på XIAO ESP32S3)

Verifiser mot Seeed-skjema før flashing:

NSS: GPIO44 (D7)
RST: GPIO43 (D6)
DIO1: GPIO2 (D1)
BUSY: GPIO1 (D0)

MQTT-topics

Topic	Retning
hytte/sensor/temp_inne	ESPHome → cabin_node
hytte/sensor/temp_ute	ESPHome → cabin_node
hytte/sensor/batt_mv	ESPHome → cabin_node
hytte/sensor/batt_pct	ESPHome → cabin_node
hytte/lora/status	cabin_gw → alu

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