go-c8y-cli example on using ssh to forward a port from a device connected to Cumulocity using thin-edge.io

c8y-proxycommand.md

1. Append the ssh config to your machine's ssh config file

   The following snippet creates

   cat <<EOT >> ~/.ssh/config
   Host rpi5-d83addab8e9f
           User root
           PreferredAuthentications publickey
           IdentityFile ~/.ssh/id_ed25519
           ServerAliveInterval 120
           StrictHostKeyChecking no
           UserKnownHostsFile /dev/null
           ProxyCommand c8y remoteaccess server --device %n --listen -
   EOT
   

   Note: You'll need to update the IdentityFile to use your SSH private key

2. Set your c8y session

   set-session
   

3. Connect to device using ssh and use port-forwarding to connect the remote's 127.0.0.1:1883 to your machine's port 1885

   ssh -L 1885:127.0.0.1:1883 rpi5-d83addab8e9f
   

   The host is the same name used from step 1.

4. Use the forwarded port (on your machine)

   mosquitto_sub -h 127.0.0.1 -p 1885