A primary communication device having a communication initiative through a bus, the primary communication device comprising: communication circuitry configured to communicate with a plurality of secondary communication devices (13-1 - 13-6), wherein the plurality of secondary communication devices (13-1 - 13-6) are configured to perform communication under control of the primary communication device (12-1 - 12-3); and control circuitry configured to: cause the primary communication device (12-1 - 12-3) to assign a respective dynamic address to each of the plurality of secondary communication devices (13-1 - 13-6), cause the primary communication device (12-1 - 12-3) to acquire a respective capability information from at least one of the plurality of secondary communication devices (13-1 - 13-6), and cause the primary communication device (12-1 - 12-3) to assign a respective group address to at least one of the plurality of secondary communication devices (13-1 - 13-6), characterized in that the control circuitry is configured to determine whether one of the plurality of secondary communication devices (13-1 - 13-6) has a capability to have the communication initiative through the bus and has a capability to perform a group address assignment, and wherein, in a case where the control circuitry determines that the one of the plurality of secondary communication devices (13-1 - 13-6) has the capability to have the communication initiative through the bus and has the capability to perform the group address assignment, the control circuitry is configured to cause the primary communication device (12-1 - 12-3) to inform the one of the plurality of secondary communication devices (13-1 - 13-6) of the assigned group addresses. communication circuitry configured to communicate with a plurality of secondary communication devices (13-1 - 13-6), wherein the plurality of secondary communication devices (13-1 - 13-6) are configured to perform communication under control of the primary communication device (12-1 - 12-3); and control circuitry configured to: cause the primary communication device (12-1 - 12-3) to assign a respective dynamic address to each of the plurality of secondary communication devices (13-1 - 13-6), cause the primary communication device (12-1 - 12-3) to acquire a respective capability information from at least one of the plurality of secondary communication devices (13-1 - 13-6), and cause the primary communication device (12-1 - 12-3) to assign a respective group address to at least one of the plurality of secondary communication devices (13-1 - 13-6), characterized in that the control circuitry is configured to determine whether one of the plurality of secondary communication devices (13-1 - 13-6) has a capability to have the communication initiative through the bus and has a capability to perform a group address assignment, and wherein, in a case where the control circuitry determines that the one of the plurality of secondary communication devices (13-1 - 13-6) has the capability to have the communication initiative through the bus and has the capability to perform the group address assignment, the control circuitry is configured to cause the primary communication device (12-1 - 12-3) to inform the one of the plurality of secondary communication devices (13-1 - 13-6) of the assigned group addresses. cause the primary communication device (12-1 - 12-3) to assign a respective dynamic address to each of the plurality of secondary communication devices (13-1 - 13-6), cause the primary communication device (12-1 - 12-3) to acquire a respective capability information from at least one of the plurality of secondary communication devices (13-1 - 13-6), and cause the primary communication device (12-1 - 12-3) to assign a respective group address to at least one of the plurality of secondary communication devices (13-1 - 13-6), characterized in that the control circuitry is configured to determine whether one of the plurality of secondary communication devices (13-1 - 13-6) has a capability to have the communication initiative through the bus and has a capability to perform a group address assignment, and wherein, in a case where the control circuitry determines that the one of the plurality of secondary communication devices (13-1 - 13-6) has the capability to have the communication initiative through the bus and has the capability to perform the group address assignment, the control circuitry is configured to cause the primary communication device (12-1 - 12-3) to inform the one of the plurality of secondary communication devices (13-1 - 13-6) of the assigned group addresses.