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Industrial Tracker Reference Guide FW 1.8 V0.2
7 DOWNLINK MESSAGES
These messages are sent from the server to the tracker through the LoRa nettork. They are used to
either confgure or manage the tracker. Each message contains a header including:
A message type
An acknotledgement token
The remaining of the message depends on the message type described in the folloting table.
Message type
ID
Descripton
POD
0x01
Positon on demand
Set Mode
0x02
Change the tracker operatonal mode
Request
confguraton
0x03
Request the actual confguraton of the tracker
Start SOS mode
0x04
Turn on SOS mode
Stop SOS mode
0x05
Turn of SOS mode
Set Param
0x0B
Modify parameter(s)
Debug command
0xFF
Reset the tracker
Notes
1i Any unexpected message (unknotn message type, bad length, …) is discarded. Hotever, the
ack token is updated even if the message is discarded (if the payload is at least 2 bytes long).
2i The
LoRa port
to be used for dotnlink is
2
.
7.1 Acinowledge toien
It provides a tay to indicate to the applicaton that a given message has been received by the
tracker.
The acknotledge token is transmited in every uplink message, and it is updated then the tracker
receives a LoRa message. This tay, each tme the server receives a LoRa uplink, it knots thether
the previous message has been received.
The acknotledge token is four bits size. Its value ranges from 0 to 15 (0x0F).
Notes
1i The ack token value must be changed for each dotnlink.
2i It’s up to the applicaton to process or not the ack tokens.
3i It’s up to the applicaton to manage the confrmatons. It can either tait for the matching
ack token in the uplink message before sending another dotnlink or send multple dotnlink
and later taits for the acks.
Page 30 of 46
10th July 2019
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