Payload Format of tag L

Uplinks

BLE scan (Uplink, Port 3)

Depending on the number of detected BLE Beacon(s), the payload size varies between 11 - 46 bytes (1-6 APs). If there are more than 6 BLE Beacons the messages will be split into multiple uplinks.

The Total messages indicate how many uplinks are expected.

and the #Message indicates the current message out of all the uplinks.

Scan pointer is incremented with every measurement.

Byte	Size	Description	Format
0-1	2	Scan Pointer A 16-bit unsigned integer incremented with each measurement to uniquely identify the scan.	uint16
2	1	Total messages A single unsigned byte indicating the total number of uplink messages expected for this scan.	uint8
3	1	#Message The current message number in the sequence of uplinks.	uint8
4-9	6	Mac1	6 x uint8
10	1	Rssi1	int8
		…
	6	MacN MAC address of the detected BLE beacon(s), represented as six unsigned bytes.	6 x uint8
	1	RssiN Signal strength (RSSI) of the respective BLE beacon, represented as a signed byte.	int8

Current Config/Status Packet (Uplink, Port 4)

Byte	Size	Description	Format
0-3	4	Localization interval while moving, IM 32-bit unsigned integer for localization interval during motion (in seconds).	uint32, s
4-7	4	Localization interval while steady, IS 32-bit unsigned integer for localization interval while stationary (in seconds).	uint32, s
8-11	4	Config/Status interval, IC 32-bit unsigned integer for the interval between configuration updates (in seconds).	uint32, s
12-13	2	GPS timeout while waiting for fix Maximum wait time for a GNSS fix in seconds, represented as a 16-bit unsigned integer. If timeout is exceeded without a successful fix, it will stop the module and not send an uplink.	uint16, s
14-15	2	Accelerometer wakeup threshold The threshold for triggering the accelerometer, measured in mg.	uint16, mg
16-17	2	Accelerometer delay Delay after accelerometer trigger, in milliseconds. For a successful trigger the accelerometer must be triggered for this amount of time. Threshold break is examined between the first trigger and after delay expired.	uint16, ms
18	1	Device state (moving = 1, steady = 2) Device movement state (1 for moving, 2 for steady).	uint8
19-21	3	Firmware version (major,;minor; patch) Three bytes representing major, minor, and patch versions.	3 x uint8
22-23	2	Hardware version (type; revision) Two bytes representing hardware type and revision.	2 x uint8
24-27	4	Battery “keep-alive” message interval, IB Interval for battery status messages in seconds.	uint32, s
28-29	2	Batch size Number of messages batched together; every nth message is confirmed. If the confirmation is unsuccessful, it will deem the batch not delivered and will retry to deliver the batch later.	uint16
30-31	2	Buffer size Maximum buffer size for storing data, in entries. Max 8128 entries.	uint16

Status[6:2]

Status is only sent after a Config Downlink as an acknowledgement in the next Uplink. 4 bit [6:3] conf_change_id plus 1 bit [2] for success (=1) or failure (=0). conf_change_id counter resets after reaching 15 (1111).

WiFi Packet (Uplink, Port 5)

Depending on the number of detected WiFi Access Points (AP), the payload size varies between 8 - 50 bytes (1-7 APs).

Byte	Size	Description	Format
0	1	Status[6:2] + Moving flag[0] (moving = 1) Status flags, including moving flag and configuration information.	uint8
1-6	6	MAC1	6 x uint8
7	1	Rssi1	int8
…
	6	MACN MAC address of detected WiFi Access Points.	6 x uint8
	1	RSSIN Signal strength (RSSI) of respective WiFi Access Points.	int8

Button Alarm Packet (Uplink, Port 6)

Byte	Size	Description	Format
0	1	In case of a button-press 0x01 is sent Sends 0x01 upon button press and it also triggers a location acquisition.	uint8

Upon button press, trigger a location acquisition process. (if it is not running already!)

WiFi with timestamp (Uplink, Port 7)

Depending on the number of detected WiFi Access Points (AP), the payload size varies between 12 - 47 bytes (1-6 APs).

Byte	Size	Description	Format
0-3	4	Unix TS 32-bit unsigned integer representing the timestamp of the scan.	uint32
4	1	Status[6:2] + Moving flag[0] (moving = 1) Status flags and movement indicator.	uint8
5-10	6	Mac1	6 x uint8
11	1	Rssi1	int8
…		…
	6	MacN MAC address of detected WiFi Access Points.	6 x uint8
	1	RssiN Signal strength (RSSI) of respective WiFi Access Points.	int8

BLE current config (Uplink, Port 8)

Byte	Size	Description	Format
0-1	2	Scan interval BLE scanning interval in seconds.	uint16, s
2	1	Scan time Duration of BLE scan in seconds (range 0–180).	uint8, s [0..180]
3	1	Max beacons Maximum number of beacons to report.	uint8
4	1	Min. Rssi value Minimum RSSI for filtering beacons.	int8
5-14	10	Advertising name/eddystone namespace filter Filter criteria for beacon names or namespaces.	10 x ASCII or 10 x uint8
15-16	2	Accelerometer trigger hold timer Hold time for the accelerometer trigger in seconds.	uint16, s
17-18	2	Accelerometer threshold Trigger threshold for the accelerometer in mg.	uint16, mg
19	1	Scan mode 0 for no filter, 1 for name filter, 2 for namespace filter.	0 - no filter; 1 - advertised name filter 2 - eddystone namespace filter
20-21	2	BLE current configuration uplink interval Interval for sending BLE configuration in seconds.	uint16, s

GNSS (Uplink, Port 10)

Byte	Size	Description	Format
0	1	Status[6:2] + Moving flag[0] (moving = 1) Status flags including moving flag.	uint8
1-4	4	Latitude GNSS latitude in micro-degrees.	int32, 1/1’000’000 deg
5-8	4	Longitude GNSS longitude in micro-degrees.	int32, 1/1’000’000 deg
9-10	2	Altitude Altitude in decimeters.	uint16, 1/10 meter
11-14	4	Unix TS Timestamp of the GNSS data.	uint32
15-16	2	Battery Battery voltage in millivolts.	uint16, mV
17	1	TTF Time it took to acquire a fix in seconds.	uint8, s
18	1	PDOP Position dilution of precision (1/2 DOP). https://en.wikipedia.org/wiki/Dilution_of_precision_(navigation)	uint8, 1/2 meter
19	1	#satellites Number of satellites used for the fix.	uint8

Battery Packet (Uplink, Port 15)

Byte	Size	Description	Format
0	1	Status[6:2] + Low battery flag[0] (low = 1) Includes flags for status and a low battery indicator (1 if low).	uint8
1-2	2	Battery voltage Battery voltage in millivolts.	uint16, mV

Combined (Uplink, Port 51)

Combined uplink is used when there are ≤4 WiFi AP detected (7-28 extra bytes) && there is GNSS fix available && WiFi scanning is enabled.

TTF is the time it took the GNSS receiver to create a fix. We use this date to establish the timestamp for the WiFi scanning outcome. Timestamp for the WiFi scanning is TSGNSS – TTF + 10 seconds.

Depending on the number of detected WiFi Access Points (AP), the payload size varies between 27 - 48 bytes (1-4 APs).

Byte	Size	Description	Format
0	1	Status[6:2] + Low battery flag[0] (low = 1) Includes status flags and low battery flag.	uint8
1-4	4	Latitude GNSS latitude in micro-degrees.	int32, 1/1’000’000 deg
5-8	4	Longitude GNSS longitude in micro-degrees.	int32, 1/1’000’000 deg
9-10	2	Altitude Altitude in decimeters.	uint16, 1/10 meter
11-14	4	Unix TS Timestamp of GNSS data.	uint32
15-16	2	Battery Battery voltage in millivolts.	uint16, mV
17	1	TTF Time it took to acquire a fix in seconds.	uint8, s
18	1	PDOP Position dilution of precision (1/2 DOP). https://en.wikipedia.org/wiki/Dilution_of_precision_(navigation)	uint8, 1/2 meter
19	1	#satellites Number of satellites used for the fix.	uint8
20-25	6	MAC1	6 x uint8
26	1	RSSI1	int8
…
	6	MACN MAC address of detected WiFi Access Points.	6 x uint8
	1	RSSIN Signal strength (RSSI) of respective WiFi Access Points.	int8

Buffered WiFi (Uplink, Port 105)

Depending on the number of detected WiFi Access Points (AP), the payload size varies between 14 - 49 bytes (1-6 APs).

Byte	Size	Description	Format
0-1	2	Buffer level Current Buffer fill level indicating remaining unsent messages.	uint16
2-5	4	Unix TS Timestamp of WiFi scan.	uint32
6	1	Status[6:2] + Low battery flag[0] (low = 1) Includes flags for low battery and status.	uint8
7-12	6	Mac1	6 x uint8
13	1	Rssi1	int8
		…
	6	MacN MAC address of detected WiFi Access Points.	6 x uint8
	1	RssiN Signal strength (RSSI) of respective WiFi Access Points.	int8

Buffered GNSS (Uplink, Port 110)

Byte	Size	Description	Format
0-1	2	Buffer level Current Buffer fill level indicating remaining unsent messages.	uint16
2	1	Status[6:2] + Low battery flag[0] (low = 1) Includes flags for low battery and movement.	uint8
3-6	4	Latitude GNSS latitude in micro-degrees.	int32, 1/1’000’000 deg
7-10	4	Longitude GNSS longitude in micro-degrees.	int32, 1/1’000’000 deg
11-12	2	Altitude Altitude in decimeters.	uint16, 1/10 meter
13-16	4	Unix TS Timestamp of GNSS data.	uint32
17-18	2	Battery Battery voltage in millivolts.	uint16, mV
19	1	TTF Time it took to acquire a fix in seconds.	uint8, s
20	1	PDOP Position dilution of precision (1/2 DOP). https://en.wikipedia.org/wiki/Dilution_of_precision_(navigation)	uint8, 1/2 meter
21	1	#satellites Number of satellites used for the fix.	uint8

Buffered Combined (Uplink, Port 151)

Depending on the number of detected WiFi Access Points (AP), the payload size varies between 29 - 50 bytes (1-4 APs).

Byte	Size	Description	Format
0-1	2	Buffer level Current Buffer fill level indicating remaining unsent messages.	uint16
2	1	Status[6:2] + Low battery flag[0] (low = 1) Includes status flags and low battery flag.	uint8
3-6	4	Latitude GNSS latitude in micro-degrees.	int32, 1/1’000’000 deg
7 10	4	Longitude GNSS longitude in micro-degrees.	int32, 1/1’000’000 deg
11-12	2	Altitude Altitude in decimeters.	uint16, 1/10 meter
13-16	4	Unix TS Timestamp of GNSS data.	uint32
17-18	2	Battery Battery voltage in millivolts.	uint16, mV
19	1	TTF Time it took to acquire a fix in seconds.	uint8, s
20	1	PDOP Position dilution of precision (1/2 DOP). https://en.wikipedia.org/wiki/Dilution_of_precision_(navigation)	uint8, 1/2 meter
21	1	#satellites Number of satellites used for the fix.	uint8
22-27	6	Mac1	6 x uint8
28	1	Rssi1	int8
…		…
	6	MacN MAC address of detected WiFi Access Points.	6 x uint8
	1	RssiN Signal strength (RSSI) of respective WiFi Access Points.	int8

Downlinks

Set Config Packet (Downlink, Port 128)

Default values for Batch size is 10, for the buffer size it is 8128 (maximum amount of data that can be buffered).
Maximum value for Batch size is 50. If Batch size is set to 0, buffering is disabled.

Byte	Size	Description	Format
0	1	BLE advertisement (disable = 0, enable = 1) Enable/disable BLE advertisement (0 = disable, 1 = enable).	uint8
1	1	GPS (disable = 0, enable = 1) Enable/disable GNSS during location acquisition (0 = disable, 1 = enable).	uint8
2	1	WiFi (disable = 0, enable = 1) Enable/disable WiFi scanning during location acquisition (0 = disable, 1 = enable).	uint8
3-6	4	Localization interval while moving, IM Localization interval in motion, in seconds. This interval acts as a hold timer between accelerometer triggers, triggering motion. Operation is explained under functional description.	uint32, s
7-10	4	Localization interval while steady, IS Localization interval when stationary, in seconds.	uint32, s
11-14	4	Heartbeat interval, IH Interval for sending heartbeat messages, in seconds.	uint32, s
15-16	2	GPS timeout while waiting for fix Maximum wait time for a GNSS fix in seconds, represented as a 16-bit unsigned integer. If timeout is exceeded without a successful fix, it will stop the module and not send an uplink.	uint16, s
17-18	2	Accelerometer wakeup threshold Threshold in mg for accelerometer wakeup.	uint16, mg
19-20	2	Accelerometer delay Delay in milliseconds after wakeup.	uint16, ms
21-24	4	Battery “keep-alive” message interval, IB Interval for battery status updates in seconds.	uint32, s
25-26	2	Batch size Number of messages batched together; every nth message is confirmed. If the confirmation is unsuccessful, it will deem the batch not delivered and will retry to deliver the batch later.	uint16
27-28	2	Buffer size Buffer size (Byte 30-31, Size 2): Maximum buffer size for storing data, in entries. Max 8128 entries.	uint16

Buzzer Packet (Downlink, Port 129)

Byte	Size	Description	Format
0	1	Time to buzz (buzzer off = 0) Duration for the buzzer to sound in seconds (0 = off).	uint8, s

Off Packet (Downlink, Port 130)

Byte	Size	Description	Format
0	1	0x00 - Off; 0xDE - Erase flash and Off 0x00 to turn off; 0xDE to erase flash and turn off. After that device can only be activated with a button press detailed in the getting started guide.	uint8

GPS Accuracy Booster (Downlink, Port 131)

Byte	Size	Description	Format
0	1	Accuracy enhancement Time to run GNSS longer after the fix to enhance accuracy in seconds (0–59).	uint8, s [0..59]

Erase flash (Downlink, Port 132)

Byte	Size	Description	Format
0	1	0x00 - Erase flash 0x00 to erase the flash.	uint8

Enable/disable buzzer feedback upon magnet interaction (Downlink, Port 133)

Byte	Size	Description	Format
0	1	Enable/disable buzzer feedback Enable or disable buzzer feedback upon magnet interaction (0 = disable, 1 = enable).	uint8

BLE config (Downlink, Port 134)

Payloads use big endian data encoding.
The Advertising name filter string must be zero-terminated. (0x00). This condition does not apply to filtering enabled for eddystone namespace (Scan mode: 2)

Min RSSI value is a signed integer and uses two’s complement for encoding.

If Min RSSI value is 0, there is no filtering applied for RSSI.

If Max beacons is 0, there will be no limit of how many beacons will be sent.

If Scan time is 0, there is no scanning performed on the device.

Byte	Size	Description	Format
0-1	2	Scan interval Interval for BLE scanning, in seconds.	uint16, s
2	1	Scan time Duration of BLE scan in seconds (0–180).	uint8, s [0..180]
3	1	Max beacons Maximum number of beacons reported.	uint8
4	1	Min. Rssi value Minimum RSSI for filtering.	int8
5-14	10	Advertising name/eddystone namespace filter Filter for beacon names or namespaces.	10 x ASCII or 10 x uint8
15-16	2	Accelerometer trigger hold timer Hold time for accelerometer trigger in seconds.	uint16, s
17-18	2	Accelerometer threshold Threshold in mg for triggering the accelerometer.	uint16, mg
19	1	Scan mode Mode for filtering (0 = no filter, 1 = name filter, 2 = namespace filter).	0 - no filter; 1 - advertised name filter 2 - eddystone namespace filter
20-21	2	BLE current configuration uplink interval Interval for sending BLE configuration data in seconds.	uint16, s

BLE scan on-demand (Downlink, Port 135)

Byte	Size	Description	Format
0	1	0x01 - Trigger BLE scan 0x01 to initiate a BLE scan immediately.	uint8

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