Weather Modbus Server

Uses the API at weather.com to publish the status of a Personal Weather Station (PWS).

Configuration

The application can be configured via:

• appsettings.json
• command line arguments
• environment variables

Setting	Default	Description
WEATHER__APIKEY		The API key for weather.com (from weather underground).
WEATHER__POLLINTERVALSECONDS	60*5	The number of seconds between calls to the service.
WEATHER__STATIONID		The id of the PWS to query for.
MODBUS__UNITID	1	The Modbus Unit Id.
MODBUS__PORT	502	The port on which to serve Modbus.
MODBUS__IPADDRESS		The local IP Address to use for the Modbus server. Not normally needed.
MODBUS__VERBOSE	false	Set this to get more logging for Modbus.
MODBUS__DEVICE_TYPE	Tcp	(Tcp/Udp) The type of Modbus transport to use

Modbus Registers

All data is presented in input (read-only) registers.

Address	Name	Units	Scale
0	Temperature	Degrees C	0.0
1	Heat Index
2	Dew Point	Degrees C
3	Wind Chill	Degrees C
4	WindGust	KPH
5	Pressure		0.0
6	Precipitation Rate
7	Precipitation Total
8	Elevation	Meters

Running

docker-compose.yaml

version: "3.7"
services:
  modbusweather:
    image: nmodbus/weatherserver:1.0
    restart: always
    ports:
     - 502:502
    environment:
      WEATHER__APIKEY: aaaaaaaaaaaaaaaaaaaaaaaaaaa
      WEATHER__STATIONID: SSSSSSSSSSSS

or command line:

docker run -e WEATHER__APIKEY=QQQQQQQQQ -e WEATHER__STATIONID=FFFFFFFFF nmodbus/modbusweather