Micro Tracker Reference Guide FW 1.7 V1.1
Page 24 of 39
11th october 2018
Restricted distribution
5
Uplink messages
This section describes the payload messages supported by the tracker.
Unless otherwise specified, all values are transmitted in network byte order (MSB first).
Each message is composed by:
➢
A common header
➢
A specific data part
The tracker supports different types of uplink messages, that are described in following sections:
Message type
Content
Frame pending
0x00
This uplink message is sent to trigger the sending. (and speed up the
configuration of the tracker) if downlink messages are available on gateway and
no other uplink message is on the queue
Position message
0x03
GPS, low power GPS, WIFI or BLE position data
Energy status message
0x04
Used by the server to estimate the battery level. Contain information related to
the power consumption
Heartbeat message
0x05
Notify the server the tracker is operational and under LoRa coverage
Activity Status message
(1)
0x07
Reports the activity counter. Used only by the activity tracking operating mode
Configuration message
(1)
0x07
Reports the partial or whole configuration of the trackers,
Shutdown message
0x09
sent when the tracker is set off
Debug message
0xFF
Internal use only
Note:
(1)
Activity status message and configuration message share the same identifier. They are differentiated
by another field.
5.1
LoRa uplink transmission
5.1.1
Strategy used
The tracker follows the LoRa requirements regarding the transmission (like duty cycle).
Each transmission is managed according to the
transmit_strat
parameter:
Strategy
ID
Static device
motion device
Single fixed
0x00
Single transmission
using network ADR
(2).
Single transmission using a fixed data rate: SF10
(1).
Single random
0x01
Single transmission using a random data rate within [SF7-SF12].
Dual random
0x02
Double transmissions:
•
First transmission using a random data rate within [SF7-SF8].
•
Second transmission using a random data rate within [SF9-
SF12].
.
Network ADR
0x04
Single transmission using network ADR
(2).
Dual fixed
0x03
Double transmission
using network ADR
(2).
Double transmissions:
•
First transmission using a random data rate within [SF7-SF8].
•
Second transmission using a fixed data rate: SF10
(1) .
Notes:
(1)
Value provisioned in the device in the factory
(2)
Number of retransmission and rate managed by the network (with the same sequence number)
Refer the section
LoRa parameters
for more details.
