JT/T 808 Gateway Data Exchange Format

This page defines the format of data exchange between emqx_jt808 and EMQX.

Convention:

• Payload is assembled in JSON format.
• JSON Key names are in lowercase.

JSON Structure Example

Terminal to Server

{
  "header" : {
    "msg_id" : 1,
    "encrypt": 0,
    "len": VAL,
    "phone": 13900000000,
    "msg_sn": 0
  },
  "body": {
    "seq": 1,
    "id": 1,
    "result": 0
  }
}

Server to Terminal

{
  "header": {
    "msg_id": 32769,
    "encrypt": 0,
    "phone": 13900000000,
    "msg_sn": 0
  },
  "body": {
    "seq": 1,
    "id": 1,
    "result": 0
  }
}

Data Type Correspondence Table

JT808 Defined Type	In JSON Type	Comment
BYTE	integer	in decimal
WORD	integer	in decimal
DWORD	integer	in decimal
BYTE(n)	string
BCD(n)	string
STRING	string

Field Correspondence Table

Message Header Fields

Field	JSON Key name	Value Type	Value Type in JSON
Message ID	msg_id	word	integer
Encryption Method	encrypt	word	integer
Terminal Phone Number	phone	bcd(6)	string
Message Serial Number	msg_sn	word	integer

Optional Field	JSON Key name	Value Type	Value Type in JSON
Total Number of Messages	frag_total	word	integer
Message Package Serial Number	frag_sn	word	integer

• When frag_total and frag_sn exist, it indicates that the message body is long and is split into multiple packages.

Message Body Fields

General Response from Terminal "msg_id": 1 0x0001

Field	JSON Key name	Value Type	Value Type in JSON
Response Serial Number	seq	word	integer
Response ID	id	word	integer
Result	result	byte	integer

General Response from Platform "msg_id": 32769 0x8001

Field	JSON Key name	Value Type	Value Type in JSON
Response Serial Number	seq	word	integer
Response ID	id	word	integer
Result	result	byte	integer

Terminal Heartbeat "msg_id": 2 0x0002

Empty JSON

Re-transmission Request for Sub-package "msg_id": 32771 0x8003

Field	JSON Key name	Value Type	Value Type in JSON
Original Message Serial Number	seq	word	integer
Total Number of Re-transmission Packages	length	byte	integer
Re-transmission Package ID List	ids	byte(2*length)	list of integer

Terminal Registration "msg_id": 256 0x0100

Field	JSON Key name	Value Type	Value Type in JSON
Province ID	province	word	integer
City ID	city	word	integer
Manufacturer ID	manufacturer	byte(5)	string
Terminal Model	model	byte(20)	string
Terminal ID	dev_id	byte(7)	string
Vehicle Color	color	byte	integer
Vehicle Identification	license_number	string	string

Terminal Registration Response "msg_id": 33024 0x8100

Field	JSON Key name	Value Type	Value Type in JSON
Response Serial Number	seq	word	integer
Result	result	byte	integer

This field is only present after a successful registration

Optional Field	JSON Key name	Value Type	Value Type in JSON
Authentication Code	auth_code	string	string

Terminal Logout "msg_id": 3 0x0003

Empty JSON

Terminal Authentication "msg_id": 258” 0x0102

Field	JSON Key name	Value Type	Value Type in JSON
Authentication Code	code	string	string

Set Terminal Parameters "msg_id": 33027” 0x8103

Field	JSON Key name	Value Type	Value Type in JSON
Total Number of Parameters	length	byte	integer
Parameter Item List	params	list	list of id and value. [{"id":ID, "value": VAL}, ...]
Parameter Item	id	dword	integer
Parameter Value	value	byte	integer

Explanation of parameter IDs as per protocol.

Query Terminal Parameters "msg_id": 33028” 0x8104

Empty JSON

Query Specific Terminal Parameters "msg_id": 33030” 0x8106

Field	JSON Key name	Value Type	Value Type in JSON
Total Number of Parameters	length	byte	integer
Parameter ID List	ids	byte(2*length)	list of id. [1, 2, 3, 4, ...]

Elements in the parameter ID list are integers

Query Terminal Response Parameters "msg_id": 260” 0x0104

Field	JSON Key name	Value Type	Value Type in JSON
Response Serial Number	seq	word	integer
Number of Response Parameters	length	byte	integer
Parameter Item List	params	list	list of id and value. [{"id":ID, "value": VAL}, ...]
Parameter Item	id	dword	integer
Parameter Value	value	byte	integer

Explanation of parameter IDs as per protocol.

Terminal Control `"msg_id": 33029” 0x8105

Field	JSON Key name	Value Type	Value Type in JSON
Command Word	command	byte	integer
Command Parameter	param	string	string

Query Terminal Properties "msg_id": 33031” 0x8107

Empty JSON

Query Terminal Property Response "msg_id": 263” 0x0107

Field	JSON Key name	Value Type	Value Type in JSON
Terminal Type	type	word	integer
Manufacturer ID	manufacturer	byte(5)	string
Terminal Model	model	byte(20)	string
Terminal ID	id	byte(7)	string
Terminal SIM Card ICCID	iccid	byte(10)	string
Terminal Hardware Version Number	hardware_version	string	string
Terminal Firmware Number	firmware_version	string	string
GNSS Module Properties	gnss_prop	byte	integer
Communication Module Properties	comm_prop	byte	integer

• The length of the terminal hardware version number and terminal firmware number will be used for binary message parsing and are not exposed.

Terminal Upgrade Package Command "msg_id": 33032 0x8108

Field	JSON Key name	Value Type	Value Type in JSON
Upgrade Type	type	byte	integer
Manufacturer ID	manufacturer	byte(5)	string
Version Number Length	ver_len	byte	integer
Version Number	version	string	string
Upgrade Package Length	fw_len	dword	integer
Upgrade Package	firmware	binary	string(base64 encoded)

Terminal Upgrade Result Notification "msg_id": 264 0x0108

Field	JSON Key name	Value Type	Value Type in JSON
Upgrade Type	type	byte	integer
Upgrade Result	result	byte	integer

Location Information Report "msg_id": 512 0x0200

Field	JSON Key name	Value Type	Value Type in JSON
Alarm Flag	alarm	dword	integer
Status	status	dword	integer
Latitude	latitude	dword	integer
Longitude	longitude	dword	integer
Altitude	altitude	word	integer
Speed	speed	word	integer
Direction	direction	word	integer
Time	time	bcd(6)	string

Optional Field	JSON Key name	Value Type	Value Type in JSON
Additional Location Information Items	extra	-	map

• Additional location information items, in extra

Field (Additional Information Description)	JSON Key name	Value Type	Value Type in JSON
Mileage	mileage	dword	integer
Fuel Meter	fuel_meter	word	integer
Speed from Driving Record Function	speed	word	integer
ID of Alarm Events Needing Manual Confirmation	alarm_id	word	integer
Overspeed Alarm Additional Information (Length 1 or 5)	overspeed_alarm	-	map
Entry/Exit Area/Route Alarm Additional Information	in_out_alarm	-	map
Route Travel Time Too Short/Too Long Alarm Additional Information	path_time_alarm	-	map
Extended Vehicle Signal Status Bits	See Status Bit Table	-	-
IO Status Bits	io_status	-	map
Analog	analog	-	map
Wireless Communication Network Signal Strength	rssi	byte	integer
GNSS Satellite Count	gnss_sat_num	byte	integer
Length of Subsequent Custom Information	custome	-	string(base64 encoded)

• Overspeed alarm additional information (length 1 or 5), in map overspeed_alarm

Field	JSON Key name	Value Type	Value Type in JSON
Location Type	type	byte	integer

Optional Field	JSON Key name	Value Type	Value Type in JSON
Area or Segment ID	id	dword	integer

• Entry/Exit Area/Route Alarm Additional Information, in map in_out_alarm

Field	JSON Key name	Value Type	Value Type in JSON
Location Type	type	byte	integer
Area or Segment ID	id	dword	integer
Direction	direction	byte	integer

• Route Travel Time Too Short/Too Long Alarm Additional Information, in map path_time_alarm

Field	JSON Key name	Value Type	Value Type in JSON
Segment ID	id	dword	integer
Route Travel Time	time	word	integer
Result	result	byte	integer

• IO Status Bits, in map io_status

Field	JSON Key name	Value Type	Value Type in JSON
Deep Sleep Status	deep_sleep	1 bit	integer
Sleep Status	sleep	1 bit	integer

• Analog, in map analog

Field	JSON Key name	Value Type	Value Type in JSON
Analog 0	ad0	16 bits	integer
Analog 1	ad1	16 bits	integer

• Extended Vehicle Signal Status Bits, in map extra

Field	JSON Key name	Value Type	Value Type in JSON
Signal	signal	- 2 bits	map, {"low_beam": VAL, "high_beam": VAL}
Right Turn Signal	right_turn	1 bit	integer
Left Turn Signal	left_turn	1 bit	integer
Brake Signal	brake	1 bit	integer
Reverse Signal	reverse	1 bit	integer
Fog Light Signal	fog	1 bit	integer
Side Marker	side_marker	1 bit	integer
Horn Status	horn	1 bit	integer
Air Conditioner Status	air_conditioner	1 bit	integer
Neutral Signal	neutral	1 bit	integer
Retarder Working	retarder	1 bit	integer
ABS Working	abs	1 bit	integer
Heater Working	heater	1 bit	integer
Clutch Status	cluth	1 bit	integer

• Signal Status, in map signal

Field	JSON Key name	Value Type	Value Type in JSON
Low Beam Signal	low_beam	1 bit	integer
High Beam Signal	high_beam	1 bit	integer

Example:

{
  "header": {
    "msg_id": 1,
    "encrypt": 0,
    "len": VAL,
    "phone": 13900000000,
    "msg_sn": 0
  },
  "body": {
    "alarm": VAL,
    "status": VAL,
    "latitude": VAL,
    "longitude": VAL,
    "altitude": VAL,
    "speed": VAL,
    "direction": VAL,
    "time": VAL,
    "extra": {
      "mileage": VAL,
      "fuel_unit": VAL,
      "speed": VAL,
      "alarm_id": VAL,
      "overspeed_alarm": {
        "type": VAL,
        "id": VAL
      },
      "in_out_alarm": {
        "type": VAL,
        "id": VAL,
        "direction": VAL
      },
      "path_time_alarm": {
        "id": VAL,
        "time": VAL,
        "result": VAL
      },
      "signal": {
        "low_beam": VAL,
        "high_beam": VAL
      },
      "right_turn": VAL,
      "left_turn": VAL,
      "brake": VAL,
      "reverse": VAL,
      "fog": VAL,
      "side_marker": VAL,
      "horn": VAL,
      "air_conditioner": VAL,
      "neutral": VAL,
      "retarder": VAL,
      "abs": VAL,
      "heater": VAL,
      "cluth": VAL,
      "io_status": {
        "deep_sleep": VAL,
        "sleep": VAL
      },
      "analog": {
        "ad0": VAL,
        "ad1": VAL
      }
    }
  }
}

Position Information Query "msg_id": 33281 0x8201

Empty JSON

Position Information Query Response "msg_id": 513 0x0201

Field	JSON Key name	Value Type	Value Type in JSON
Response Seq	seq	word	integer
Position Report	params	-	map

Temporary Location Tracking Control "msg_id": 33282 0x8202

Field	JSON Key name	Value Type	Value Type in JSON
Interval	period	word	integer
Tracking Duration	expiry	dword	integer

Manual Alarm Confirmation Message "msg_id": 33283 0x8203

Field	JSON Key name	Value Type	Value Type in JSON
Alarm Message Seq	seq	word	integer
Manual Alarm Type	type	dword	integer

Text Message Dispatch "msg_id": 33536 0x8300

Field	JSON Key name	Value Type	Value Type in JSON
Flag	flag	byte	integer
Text Info	text	string	string

Event Setting "msg_id": 33537 0x8301

Field	JSON Key name	Value Type	Value Type in JSON
Set Type	type	byte	integer
Total Events	length	byte	integer
Event List	events	list	list of event. [{"id": ID, "length": LEN, "content": CON}, ...]
Event ID	id	byte	integer
Event Length	length	byte	integer
Event Content	content	string	string

Event Report "msg_id": 769 0x0301

Field	JSON Key name	Value Type	Value Type in JSON
Event ID	id	byte	integer

Question Dispatch "msg_id": 33538 0x8302

Field	JSON Key name	Value Type	Value Type in JSON
Flag	flag	byte	integer
Question Length	length	byte	integer
Question	question	string	string
Answer Candidate List	answers	list	list of answer. [{"id": ID, "len": LEN, "answer": ANS}, ...]
Answer ID	id	byte	integer
Answer Content Length	len	byte	integer
Answer Content	answer	string	string

Question Response "msg_id": 770 0x0302

Field	JSON Key name	Value Type	Value Type in JSON
Response Seq	seq	word	integer
Answer ID	id	byte	integer

Information Service Menu Setting "msg_id": 33539 0x8303

Field	JSON Key name	Value Type	Value Type in JSON
Set Type	type	byte	integer
Total Info Items	length	byte	integer
Info Item List	menus	list	list of menu
Info Type	type	byte	integer
Info Name Length	length	word	integer
Info Name	info	string	string

Information Service/Cancel "msg_id": 771 0x0303

Field	JSON Key name	Value Type	Value Type in JSON
Info Type	id	byte	integer
Dial/Cancel Flag	flag	byte	integer

Information Service "msg_id": 33540 0x8304

Field	JSON Key name	Value Type	Value Type in JSON
Info Type	type	byte	integer
Info Length	length	word	integer
Info Content	info	string	string

Callback Phone "msg_id": 33792 0x8400

Field	JSON Key name	Value Type	Value Type in JSON
Flag	type	byte	integer
Phone Number	phone	string	string

Phonebook Setting "msg_id": 33793 0x8401

Field	JSON Key name	Value Type	Value Type in JSON
Set Type	type	byte	integer
Total Contacts	length	byte	integer
Contact Item	contacts	list	list of contact.
Flag	type	byte	integer
Phone Number Length	phone_len	byte	integer
Phone Number	phone	string	string
Contact Length	name_len	byte	integer
Contact	name	string	string

Contact Item Example

[{"type": TYPE, "phone_len", PH_LEN, "phone": PHONE, "name_len": NAME_LEN, "name": NAME}, ...]

Vehicle Control "msg_id": 34048 0x8500

Field	JSON Key name	Value Type	Value Type in JSON
Control Flag	flag	byte	integer

Vehicle Control Response "msg_id": 1280 0x0500

Field	JSON Key name	Value Type	Value Type in JSON
Response Serial	seq	word	integer
Location Report Body	location	map	map of location

Setting Circular Area "msg_id": 34304 0x8600

Field	JSON Key name	Value Type	Value Type in JSON
Setting Attribute	type	byte	integer
Total Number of Areas	length	byte	integer
Area Item	areas	list	list of area.
Area ID	id	dword	integer
Area Property	flag	dword	integer
Center Latitude	center_latitude	dword	integer
Center Longitude	center_longitude	dword	integer
Radius	radius	dword	integer
Start Time	start_time	string	string
End Time	end_time	string	string
Maximum Speed	max_speed	word	integer
Overspeed Duration	overspeed_duration	byte	integer

Area List Example

jsonCopy code
[{"id": ID,
   "flag": FLAG,
   "center_latitude": CEN_LAT,
   "center_longitude": CEN_LON,
   "radius": RADIUS,
   "start_time": START_TIME,
   "end_time": END_TIME,
   "max_speed": MAX_SPEED,
   "overspeed_duration": OVERSPEED_DURATION
   },
  ...
 ]

Deleting Circular Area "msg_id": 34305 0x8601

Field	JSON Key name	Value Type	Value Type in JSON
Number of Areas	length	byte	integer
List of Area IDs	ids	list	list of id.
Area ID 1~n	-	dword	integer

[ID1, ID2, ...]

Setting Rectangular Area "msg_id": 34306 0x8602

Field	JSON Key name	Value Type	Value Type in JSON
Setting Attribute	type	byte	integer
Total Number of Areas	length	byte	integer
Area Item	areas	list	list of rectangle area.
Area ID	id	dword	integer
Area Property	flag	dword	integer
Upper Left Latitude	lt_lat	dword	integer
Upper Left Longitude	lt_lng	dword	integer
Lower Right Latitude	rb_lat	dword	integer
Lower Right Longitude	rb_lng	dword	integer
Start Time	start_time	string	string
End Time	end_time	string	string
Maximum Speed	max_speed	word	integer
Overspeed Duration	overspeed_duration	byte	integer

Deleting Rectangular Area "msg_id": 34307 0x8603

Field	JSON Key name	Value Type	Value Type in JSON
Number of Areas	length	byte	integer
List of Area IDs	ids	list	list of id.
Area ID 1~n	-	dword	integer

Setting Polygonal Area "msg_id": 34308 0x8604

Field	JSON Key name	Value Type	Value Type in JSON
Area ID	id	dword	integer
Area Property	flag	dword	integer
Start Time	start_time	string	string
End Time	end_time	string	string
Maximum Speed	max_speed	word	integer
Overspeed Duration	overspeed_duration	byte	integer
Total Number of Vertices	length	word	integer
List of Vertex Items	points	list	list of point.
Vertex Latitude	lat	dword	integer
Vertex Longitude	lng	dword	integer

Deleting Polygonal Area "msg_id": 34309 0x8605

Field	JSON Key name	Value Type	Value Type in JSON
Number of Areas	length	byte	integer
List of Area IDs	ids	list	list of id.
Area ID 1~n	-	dword	integer

Setting Route "msg_id": 34310 0x8606

Field	JSON Key name	Value Type	Value Type in JSON
Route ID	id	dword	integer
Route Property	flag	word	integer
Start Time	start_time	string	string
End Time	end_time	string	string
Total Number of Turning Points	length	word	integer
Turning Point Item	points	list	list of point.
Turning Point ID	point_id	dword	integer
Segment ID	path_id	dword	integer
Turning Point Latitude	point_lat	dword	integer
Turning Point Longitude	point_lng	dword	integer
Segment Width	width	byte	integer
Segment Property	attrib	byte	integer
Overlong Threshold for Segment Driving	passed	word	integer
Insufficient Threshold for Segment Driving	uncovered	word	integer
Maximum Speed of Segment	max_speed	word	integer
Overspeed Duration for Segment	overspeed_duration	byte	integer

Deleting Route "msg_id": 34311 0x8607

Field	JSON Key name	Value Type	Value Type in JSON
Number of Routes	length	byte	integer
List of Route IDs	ids	list	list of id
Route ID	-	dword	integer

Driving Record Data Collection Command "msg_id": 34560 0x8700

Field	JSON Key name	Value Type	Value Type in JSON
Command	command	byte	integer
Data Block	param	string(base64 encoded)	string

Driving Record Data Upload "msg_id": 1792 0x0700

Field	JSON Key name	Value Type	Value Type in JSON
Response Serial Number	seq	word	integer
Command	command	byte	integer
Data Block	data	string(base64 encoded)	string

Driving Record Parameter Downward Command "msg_id": 34561 0x8701

Field	JSON Key name	Value Type	Value Type in JSON
Command	command	byte	integer
Data Block	param	string(base64 encoded)	string

Electronic Waybill Report "msg_id": 1793 0x0701

Field	JSON Key name	Value Type	Value Type in JSON
Electronic Waybill Length	length	dword	integer
Electronic Waybill Content	data	string(base64 encoded)	string

Request for Uploading Driver Identity Information "msg_id": 34562 0x8702

Empty JSON

Driver Identity Information Collection Report "msg_id": 1794 0x0702

Field	JSON Key name	Value Type	Value Type in JSON
Status	status	byte	integer
Time	time	string	string
IC Card Read Result	ic_result	byte	integer
Driver Name	driver_name	string	string
Professional Qualification Certificate Code	certificate	string	string
Issuing Authority Name	organization	string	string
Certificate Validity	cert_expiry	string	string

Bulk Upload of Location Data "msg_id": 1796 0x0704

Field	JSON Key name	Value Type	Value Type in JSON
Location Data Type	type	byte	integer
Number of Data Items	length	word	integer
Location Reporting Data Items	location	list	list of location

CAN Bus Data Upload "msg_id": 1797 0x0705

Field	JSON Key name	Value Type	Value Type in JSON
Number of Data Items	length	word	integer
CAN Bus Data Reception Time	time	bcd(5)	integer
CAN Bus Data Items	can_data	list	list of can data.
CAN Bus Channel Number	channel	1 bit	integer
Frame Type	frame_type	1 bit	integer
Data Collection Method	data_method	1 bit	integer
CAN Bus ID	id	29 bits	integer
CAN Data	data	binary	string(base64 encoded)

Multimedia Event Information Upload "msg_id": 2048 0x0800

Field	JSON Key name	Value Type	Value Type in JSON
Multimedia Data ID	id	dword	integer
Multimedia Type	type	byte	integer
Multimedia Encoding Format	format	byte	integer
Event Item Code	event	byte	integer
Channel ID	channel	byte	integer

Multimedia Data Upload "msg_id": 2049 0x0801

Field	JSON Key name	Value Type	Value Type in JSON
Multimedia ID	id	dword	integer
Multimedia Type	type	byte	integer
Multimedia Encoding Format	format	byte	integer
Event Item Code	event	byte	integer
Channel ID	channel	byte	integer
Location Reporting	location	byte(28)	map
Multimedia Data Package	multimedia	binary	string(base64 encoded)

Response to Multimedia Data Upload "msg_id": 34816 0x8800

Field	JSON Key name	Value Type	Value Type in JSON
Multimedia ID	mm_id	dword	integer
Total Number of Retransmission Packages	length	byte	integer
List of Retransmission Package IDs	retx_ids	list	list of retry IDs

Immediate Camera Capture Command "msg_id": 34817 0x8801

Field	JSON Key name	Value Type	Value Type in JSON
Channel ID	channel_id	byte	integer
Capture Command	command	word	integer
Interval/Recording Time	period	word	integer
Save Flag	save	byte	integer
Resolution	resolution	byte	integer
Image/Video Quality	quality	byte	integer
Brightness	bright	byte	integer
Contrast	contrast	byte	integer
Saturation	saturate	byte	integer
Chromaticity	chromaticity	byte	integer

Immediate Camera Capture Response "msg_id": 2053 0x0805

Field	JSON Key name	Value Type	Value Type in JSON
Response Serial Number	seq	word	integer
Result	result	byte	integer
Number of Multimedia IDs	length	word	integer
List of Multimedia IDs	ids	byte(4*length)	integer

Storage Multimedia Data Retrieval "msg_id": 34818 0x8802

Field	JSON Key name	Value Type	Value Type in JSON
Multimedia Type		byte
Channel ID		byte
Event Item Code		byte
Start Time		string
End Time		string

Response to Storage Multimedia Data Retrieval "msg_id": 2050 0x0802

Field	JSON Key name	Value Type	Value Type in JSON
Response Serial Number	seq	word	integer
Total Number of Multimedia Data Items	length	word	integer
Search Items	result	list	list of search result
Multimedia ID	id	dword	integer
Multimedia Type	type	byte	integer
Channel ID	channel	byte	integer
Event Item Code	event	byte	integer
Location Reporting	location	byte(28)	map

Command for Uploading Stored Multimedia Data "msg_id": 34819 0x8803

Field	JSON Key name	Value Type	Value Type in JSON
Multimedia Type	type	byte	integer
Channel ID	channel	byte	integer
Event Item Code	event	byte	integer
Start Time	start_time	string	string
End Time	end_time	string	string
Delete Flag	delete	byte	integer

Audio Recording Start Command "msg_id": 34820 0x8804

Field	JSON Key name	Value Type	Value Type in JSON
Recording Command	command	byte	integer
Recording Time	time	word	integer
Save Flag	save	byte	integer
Audio Sampling Rate	rate	byte	integer

Command for Single Stored Multimedia Item Retrieval Upload "msg_id": 34821 0x8805

Field	JSON Key name	Value Type	Value Type in JSON
Multimedia ID	id	dword	integer
Delete Flag	flag	byte	integer

Downward Data Transmission "msg_id": 35072 0x8900

Field	JSON Key name	Value Type	Value Type in JSON
Transmitted Message Type	type	byte	integer
Transmitted Message Content	data	binary	string(base64 encoded)

Upward Data Transmission "msg_id": 2304 0x0900

Field	JSON Key name	Value Type	Value Type in JSON
Transmitted Message Type	type	byte	integer
Transmitted Message Content	data	binary	string(base64 encoded)

Data Compression Report "msg_id": 2305 0x0901

Field	JSON Key name	Value Type	Value Type in JSON
Compressed Message Length	length	dword	integer
Compressed Message Body	data	binary	string(base64 encoded)

Platform RSA Public Key "msg_id": 35328 0x8A00

Field	JSON Key name	Value Type	Value Type in JSON
e	e	dword	integer
n	n	byte(128)	string(base64 encoded)

Terminal RSA Public Key "msg_id": 2560 0x0A00

Field	JSON Key name	Value Type	Value Type in JSON
e	e	dword	integer
n	n	byte(128)	string(base64 encoded)

Reserved 0x8F00 ~ 0x8FFF

Reserved 0x0F00 ~ 0x0FFF