1. Introduction

This module was originally written to be executed on a Raspberry Pi, attached to the P1 port of a smartmeter.

Note that the parser module has no external dependencies, it could be reused elsewhere with little effort.

1.1 Installation

Assuming a Raspberry Pi;

sudo apt update
sudo apt install -y socat git liblua5.1-0-dev
wget https://luarocks.org/releases/luarocks-3.9.1.tar.gz
tar zxpf luarocks-3.9.1.tar.gz
cd luarocks-3.9.1
./configure && make && sudo make install
cd ..
rm -rf luarocks-3.9.1
rm luarocks-3.9.1.tar.gz

sudo luarocks install copas
sudo luarocks install penlight
# luamqtt fork to be used for now
sudo luarocks install Tieske/luamqtt --dev
# homie development branch for now
sudo luarocks install homie --dev
sudo luarocks install luabitop

git clone https://github.com/Tieske/homie-p1
cd homie-p1
sudo luarocks make
cd ..
rm -rf homie-p1

# while waiting for PR https://github.com/hishamhm/copas-async/pull/1
git clone https://github.com/Tieske/copas-async
cd homie-p1
git checkout updates
sudo luarocks make
cd ..
rm -rf copas-async

1.2 Daemonizing

Create the following systemd config file; homiep1.service:

 [Unit]
 Description=P1-Smartmeter to Homie bridge
 After=network-online.target

 [Service]
 Environment="P1_SOCAT_INPUT=/dev/ttyUSB0,b115200"
 Environment="HOMIE_MQTT_URI=mqtt://synology"
 Environment="HOMIE_LOG_LOGLEVEL=debug"
 ExecStart=/bin/bash /usr/local/bin/homiep1
 StandardOutput=inherit
 StandardError=inherit
 Restart=always
 User=pi

 [Install]
 WantedBy=multi-user.target

Then do:

cp homiep1.service /lib/systemd/system/ to copy it in place
sudo systemctl start homiep1.service to start it
sudo systemctl status homiep1.service to check status
sudo systemctl enable homiep1.service to enable it on system start

homie-p1

Contents

Topics

Modules

Scripts

1. Introduction

1.1 Installation

1.2 Daemonizing