The disclosure provides a client device for hearing device communication and related method. The client device comprises a processing unit, a memory unit, and an interface. The processing unit is configured to send a session request for a session to the hearing device via the interface. The processing unit is configured to receive a session response from the hearing device via the interface. The processing unit is configured to obtain a session key based on e.g. the session response. The processing unit is configured to determine hearing device data and/or to generate session data e.g. based on the session key and the hearing device data. The processing unit is configured to send the session data to the hearing device via the interface.