[Feature Request] Add AppData Flag Value to Denote IoT Gateways

[mljanke]

We are implementing an IoT Gateway that uses MeshCore for telemetry. We are sending a flooded avert message from an IoT Gateway and would like to set an appropriate device type flag in the AppData flags byte. At present, Gateways do not fall under existing flag values:

0x01 | is chat node | advert is for a chat node
0x02 | is repeater | advert is for a repeater
0x03 | is room server | advert is for a room server
0x04 | is sensor | advert is for a sensor server
0x10 | has location | appdata contains lat/long information
0x20 | has feature 1 | Reserved for future use.
0x40 | has feature 2 | Reserved for future use.
0x80 | has name | appdata contains a node name

We propose the lower nibble value of 0x05 to denote an IoT Gateway type.

[jschrempp]

How will you rate limit traffic so that it does not become an accidental DoS attack?

[mljanke]

I am not trying to design an entire infrastructure within a feature request - just trying to get a flag value that denotes a device type.