-- Super basic NCOM dissector for Wireshark. You will need to have a copy of the latest 'wssdl.lua' 
-- from https://github.com/diacritic/wssdl
-- Put the 'wssdl.lua' in the root folder of Wirshark and then put this file in '~\Wireshark\plugins\' 
-- and then run Wireshark (the latest versions of Wireshark will autoload the lua scripts)

-- Last edit - 170202 - HH

local wssdl = require 'wssdl'

NCOM_packet = wssdl.packet
{
sync_byte					:	u8()				;
time						:	u16()	:	le()	;
acc_x						:	i24() 	:	le()	;
acc_y						:	i24() 	:	le()	;
acc_z						:	i24()	:	le()	;
ang_rate_x					:	i24() 	:	le()	;
ang_rate_y					:	i24() 	:	le()	;
ang_rate_z					:	i24() 	:	le()	;
status_packet				:	u8()				;
check_sum_1					:	u8()				;
not_decoded_nav_data		:	bytes(38)			;
check_sum_2					:	u8()				;
status_channel				:	u8()				;
minutes_from_gps_start		:	u32()	:	le()	;
not_decoded_batch_s			:	bytes(4)			;
check_sum_3					:	u8()				;

}

wssdl.dissect {
  udp.port:set {
    [3000] = NCOM_packet:proto('NCOM', 'OxTS NCOM binary format')
  }
}