Set the name of the 'main' Device

[ButKor]

Is your feature improvement request related to a problem? Please describe.
I would like to use a serial-number as my technical device-id, but use a different/more meaningful name for the Device in Cumulocity.
For child-devices and services this works perfectly fine with specifying different @id and name fields in the registration messages. But I can't find a way to do the same for the main-device - here it always uses the CN of the certificate.
Once registered, thin-edge.io disallows to set the name via the tedge mqtt pub "te/device/main///twin/name" or the /etc/tedge/device/inventory.json (as documented here)

Describe the solution you'd like
I would like to be able to set a different name than ID for a main device, e.g. via a new tedge config field device.name in same manner as done with device.type.

Describe alternatives you've considered
Tried setting the name via:

• tedge mqtt pub "te/device/main///twin/name" '"my-name"'
• adding name to /etc/tedge/device/inventory.json
• sending a registration message stating different id and name field (though I don't think that is possible for a main device).

[rina23q]

I would add additional implementation context.

The 100 message is sent during tedge connect c8y. The second field is using device_id (= the same name as the device certificate's CN), although device_type is already configurable as device.type in tedge config.

thin-edge.io/crates/core/tedge/src/cli/connect/c8y_direct_connection.rs

Line 146 in 193ac91

format!("100,{},{}", device_id, device_type).as_bytes(),

So, the implementation should be straight-forward.