p1mqtt

p1mqtt

A simple but flexible program that can read data from a smart meter P1 port and publish it to an MQTT channel. You have (almost) complete control on how this data is encoded in the mqtt messages. For example, currently json, msgpack, binc, and cbor are supported. You are also free to combine the smart meter measurements in one message for a single MQTT topic or to send out each measurement to a separate mqtt topic.

Building & installing

First make sure you have setup your Go environment. After having setup your $GOPATH you can do a

go get github.com/mhe/p1mqtt

to install a p1mqtt binary in your $GOPATH/bin.

Alternatively you can clone this repository somewhere (for example in your $GOPATH/src) and install the dependencies

cd p1mqtt
go get ...

Then build it:

go build .

Which should result in a binary in your working directory.

Configuration

p1mqtt is configured through a small configuration file. This repository contains an example configuration file (p1mqtt-example.tom) that should be mostly self-explainatory. There are also a couple of commandline flags that can be set, see

./p1mqtt -h

Experimenting

p1mqtt also supports reading data from a file, which is convenient to test your configuration. To generate such a file for testing simply store the output of the serial port somewhere, e.g.:

dd if=/dev/ttyUSB0 of=testfile.bin

You can specify that a file should be used for input with the commandline flags, for example:

./p1mqtt -config p1mqtt.toml -testfile ./testfile.bin -ratelimit 10

The ratelimit flag allows you to simulate a smart meter somewhat by releasing a telegram every n (in this case, 10) seconds.

Related projects

p1mqtt uses the dsmr4p1 library for parsing the P1 telegrams.