Make mqtt client id unique

[spuder]

[15:07:49][C][mqtt:148]: MQTT:
[15:07:49][C][mqtt:149]:   Server Address: 192.168.81.108:8883 (192.168.81.108)
[15:07:49][C][mqtt:151]:   Username: 'bblp'
[15:07:49][C][mqtt:152]:   Client ID: 'openspool'
[15:07:49][C][mqtt:153]:   Clean Session: YES
[15:07:49][C][mqtt:161]:   Topic Prefix: ''
[15:07:49][C][improv_serial:032]: Improv Serial:

Instead of using name variable, append the Mac address to the name to make client id unique. This would be needed for when multiple esp32s are connecting to the same printer.

client_id: ${name}

[raihei]

I tried it, but looks like it is not possible. Or is there another way?

[spuder]

Thanks for trying, if it isn't templateable then it likely isn't possible.
I ran into the same issue with the mqtt broker address not being templatable.

https://discord.com/channels/429907082951524364/524177279270780928/1300834004718587998

That was fixed in esphome/esphome#7716

I suspect it might take a pull request to esphome community to fix this.

Feel free to take this on if you are interested. As it isn't really going to break anything I"m going to mark as wont-fix for now.