Micro Tracker Reference Guide FW 1.7 V1.1
Page 7 of 39
11th october 2018
Restricted distribution
4.2
Side operations
Whatever the operating mode, optional messages can be sent according to the configuration. The side
operations are:
➢
Periodic position message
➢
Position on Demand
➢
Alert positions
➢
SOS mode
For Periodic, Position on Demand and Alert position message, sending of the position is driven by the chosen
transmit strategy:
➢
Transmit_strat
equal to 2 or 3: Position message is sent twice if static, 4 times if moving
➢
Transmit_strat
equal to 0, 1 or4: Position message is sent 3 times
4.2.1
Periodic position message:
The device sends periodically its position at the
periodic_pos_period
frequency. Usually, this reporting
frequency is very long. If the
periodic_pos_period
is set to 0, this message is not sent.
This periodic position uses the
geoloc_method
geolocation strategy.
It can be accrued to all operational modes
4.2.2
Position on Demand:
Position requests are done via LoRa downlink message. The device answers with its current position.
The geolocation strategy chosen for
geoloc_method
is used to have this position.
4.2.3
Alert position
After a double short press on the button:
➢
The tracker sends its position (using
geoloc_method
geolocation strategy
)
.
➢
LoRa messages is tagged with an alert flag. (see
uplink description
for more detail)
➢
Once done the tracker removes its alert state. There is no server acknowledge. (
config_flags
, bit2=0)
4.2.4
SOS mode:
Activation/deactivation:
➢
using LoRa downlink (See section
SOS mode configuration
for more details)
➢
using double press button (if bit2 of
config_flags
is set)
When it is activated:
➢
Send continuously positions at a fixed period of 120 s.
➢
Geolocation strategy: WGPS (WIFI then GPS if WIFI fails).
➢
GPS timeout set to 120 seconds (fixed).
➢
LoRa messages tagged with an alert flag. (see
uplink description
for more detail)
Notes:
1-
The side operations can be accrued.
2-
SOS mode using button press and alert position can’t work at the same time. Both modes are using
the same bit of
config_flags:
✓
bit2=0:
alert position
activated
✓
bit2=0:
SOS mode
using press button activated
