The protocol for the control interface is wrapped inside the ip.access header with the IPAC_PROTO_OSMO protocol ID (0xee). Inside the ip.access header is a struct ipaccess_head_ext with protocol ID 0x00 which indicates the control interface. After that the actual protocol is text based: * Getting the value of a variable -> GET <- GET_REPLY or ERROR * Setting the value of a variable -> SET <- SET_REPLY or ERROR * A value changes which triggers a trap <- TRAP needs to be unique within a connection. '0' is not allowed