package protocol; message prp_header { optional uint32 version = 1; optional uint32 type = 2; optional uint32 xid = 4; } enum prp_type { // Discovery and maintenance messages PRPT_HELLO = 0; PRPT_ECHO_REQUEST = 1; PRPT_ECHO_REPLY = 2; // Statistics and measurement messages PRPT_STATS_REQUEST = 3; PRPT_STATS_REPLY = 4; //Asynchronous messages PRPT_UL_SR_INFO = 5; }