A hub device comprising: a first port, a second port and a hub controller. The first port is configured to be connected to an initiator controller. The second port is configured to be connected to a target device, and wherein the target device has an address. The hub controller is configured to receive the target device address from the initiator controller via the first port, and in response: set a first-port-clock-line of the first port to busy; transmit the received target device address to the second port, to which the target device is connected; enable a bridge between the initiator controller and the target device, via the first port and the second port; release the first-port-clock-line of the first port from busy; communicate an acknowledgement message from the target device to the initiator controller via the bridge; and communicate a data transmission between the initiator controller and the target device via the bridge.