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
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