Some beacon types and data fields are already specified for future use.
In every MQTT packet an information about the beacon type is sent. It is just numerical and the types supported at the moment are:
| Name | Number | Description |
|---|---|---|
| TAG_RUUVI | 1 | Ruuvi tag |
| TAG_MIJIA | 2 | Xiaomi Mijia Thermometer 2 |
| TAG_ENERGY | 3 | OH2MP energy meter beacon |
| TAG_WATER | 4 | OH2MP water gauge beacon |
| TAG_THCPL | 5 | OH2MP thermocouple beacon |
| TAG_DS1820 | 6 | 1wire DS18x20 based thermometer |
| TAG_DHT | 7 | DHT based thermometer/hygrometer |
| TAG_WATTSON | 8 | Diy Kyoto Wattson with ESP8266 |
| TAG_MOPEKA | 9 | Mopeka✓ gas tank sensors |
| TAG_IBSTH2 | 10 | Inkbird IBS-TH2 temperature sensor |
| TAG_ALPICOOL | 11 | Alpicool portable fridges |
These same numbers are used internally in OH2MP Smart RV
These field names are chosen so that they are short to make messages more compact.
| Fieldname | Unit | Description |
|---|---|---|
| t | 1/10 °C | temperature in deciCelsius |
| rh | % | relative humidity |
| ap | hPa | athmospheric pressure |
| bu | mV | battery voltage |
| bp | % | battery percentage |
| e | Wh | energy consumption since last reset |
| et | Wh | energy consumption total |
| lv | liter | liquid volume |
| u | mV | electric voltage |
| i | mA | electric current |
| p | mW | electric power |
| m | g | mass (or weight in spoken language) |
| s | dBm | signal strength as RSSI, abs() value. |
| tt | 1/10°C | thermostat target temperature in deciCelsius |
| gh | cm | LPG level height in gas tank (see About Mopeka✓) |
{"type":1,"t":243,"rh":32,"bu":2821,"ap":1003,"s":42}
Here we see that type is 1 meaning that this is a Ruuvi tag. The temperature is 24.3°C, relative humidity 32%, battery voltage 2.821 volts and athmospheric pressure 1003 hPa. RSSI is -42 dBm.
Mopeka✓ sensors are a family of gas tank level sensors that are mounted in the bottom of gas tanks. They use ultrasound on measuring the distance to the surface of the liquified gas in the container. The exact amount of gas depends mostly on geometry of the container but also gas composition and temperature affect a little. That kind of calculations should be done elsewhere than in this gateway, eg. in Grafana. It's best to just store the centimeters as-is.