===== DSMR (P1) telegram over TCP =====
Tested with DSMR v2.2 meter, Raspbian GNU/Linux 11 (bullseye)

  * Connect serial to DSMR with a level shifter
  * Test serial connection<code>
stty -F /dev/ttyAMA0 9600 cs7 -cstopb parenb
cat /dev/serial0
</code>
  * Install ser2net<code>apt install ser2net</code>
  * Configure in /etc/ser2net.yaml<code>
connection: &con0
    accepter: tcp,23
    enable: on
    options:
      max-connections: 10
      telnet-brk-on-sync: true
    connector: serialdev,
              /dev/ttyAMA0,
              9600e71,local
</code>
  * This configuration did not open port 23 at reboot. It seems the service starts before the network is available and that didn't work. Edit the ser2net.service file<code>
systemctl edit ser2net.service

# Add the following lines:
[Unit]
After=network-online.target
Wants=network-online.target
</code>
  * Restart ser2net

{{tag>[hardware raspberry pi b ser2net dsmr p1]}}