KWh meter setup

The remote display depends on a SSH tunnel on the MTA.

File in systemd at: /etc/systemd/system/kwh-tunnel.service:

   [Unit]
   Description=Tunnel to kWh meter.
   After=network.target
   
   [Service]
   ExecStart=/usr/bin/ssh -i /etc/kwh-meter-tunnel -l dirkx -p 222 -NT \
               -o ServerAliveInterval=60 -o ExitOnForwardFailure=yes \
               -L 9999:192.168.6.111:80 83.163.200.191 -    
   RestartSec=30
   Restart=always
   
   [Install]
   WantedBy=multi-user.target

and this is received by a SSH authorized key line on the space machine:

   no-pty,permitopen="192.168.6.111:80" ssh-rsa AAAAB3NzaC1yc2EA....NFlObjqxPGezJYI0wMNlI9XiP purely-the-tunnel to the kWh meter

With localhost:9999 mapped in the CRM for those that need access.