P1 Monitor

For those who want to use P1 Monitor, it is possible to use my P1 reader (WiFi and Ethernet). Especially if you don’t want to have a Raspberry Pi in the meter cupboard, or other reasons. To map the P1 reader to the /dev/ttyUSB0, I use socat. To use socat, you have to install it and configure it.

Installing and configuring socat in P1 Monitor

First start with installing the service:

$ sudo apt install socat

Once installed, you have to make a configuration/service-file for it. nUse your favourite editor to make the socat.service file (for me it’s vi, or nano):

$ sudo vi /etc/systemd/system/socat.service
$ sudo nano /etc/systemd/system/socat.service

Fill in the following content. Note that you need to fill in the ip-address of the P1 reader. Preferable a fixed ip:

Description=Socat Serial Loopback

ExecStart=sudo /usr/bin/socat -T60 pty,link=/dev/ttyUSB0,rawer,group-late=dialout,mode=660 tcp:<ip-adres-device>:23.,retry=forever,interval=30


Save this socat.service file (“:wq” in vi and “<ctrl> + X” in nano, followed by “Y” and <enter>). Once it is saved, you have to reload the daemon, enable the new service (so it will start on (re)boot and start the service:

# Restart the daemon:
$ sudo systemctl daemon-reload
# Enable it on boot
$ sudo systemctl enable socat.service
# Start the service
$ sudo systemctl start socat.service

Now there is one thing left: the user p1mon needs to have rights to read the serial device:

$ sudo usermod -a -G dialout p1mon

All set! you’re now able to use P1 Monitor to monitor your meter 🙂