Client-server communications in mobile radio communications device

A method of communication within a mobile radio communications device between a chip-card comprising a Universal Integrated Circuit Card (UICC) in server mode and any one or more of a plurality of clients each having a same IP address,

• said method comprising:
• creating for each of said plurality of clients a socket, wherein each socket is bound to a client port;
• associating a client identifier to each of bound client ports;
• and
• making each said client identifier available to the chip-card whereby the chip card can distinguish between said plurality of clients,
• wherein said method is arranged to support both Universal Datagram Protocol (UDP) communication between a server and said plurality of clients, and Transmission Control Protocol (TCP) communication, said method being arranged to support a creation of TCP sockets, and
• wherein the method further comprises:
• sending, by the mobile radio communications device, a terminal profile message to the chip-card during a power-up sequence of the mobile radio communications device, the terminal profile message indicating that a UICC UDP server mode is supported by the mobile radio communications device when said plurality of clients comprise UDP clients, and the terminal profile message indicating that the TCP and the UICC in server mode are supported by the mobile radio communications device when said plurality of clients comprise TCP clients;
• and
• sending, by the chip-card, an open channel proactive command signaling to the mobile radio communications device, the open channel proactive command signaling indicating a wish of the chip-card to open a channel in a protocol mode as indicated by the terminal profile message.