Function someipSubscribe

someipSubscribe(opts: SomeipSubscribeOpts): Promise<void>
Client subscription: request_service → request_event (single group) → subscribe on the main vSomeIP client.
Parameters
- opts: SomeipSubscribeOpts
  Service, instance, event group, event id, and optional channel / timing / event type.
Returns Promise<void>
Resolves when subscription commands have been accepted by the main process (delivery still depends on SD / network).

Throws
When the SOME/IP device is missing or vSomeIP returns an error.

Remarks
After subscribing, listen for payloads with UtilClass.OnSomeipMessage on the appropriate service.instance.method key.