A client device (13) is configured to transmit a relay request to a relay device (14). The relay request comprises a first device identifier identifying the client device and one or more first link identifiers identifying one or more links of which at least one links a further device (12) with a network node via the client device. The client device is further configured to receive an acceptance message accepting the relay request from the relay device and transmit data associated with the one or more links to the relay device in dependence on receipt of the acceptance message. The relay device is configured to receive the relay request from the client device, determine whether the relay request can be accepted, associate the first device identifier with each of the first link identifiers, and transmit the acceptance message upon determining that the relay request can be accepted.