4 Functioning
4.1 Main operating modes
This section describes the different operational modes supported by the trackers.
Standby mode: The tracker is sending periodically short LoRa messages, called heartbeat at the chosen
period (lora_period). Device positions can be obtained in this mode by using the side operations features (see
next section).
Motion tracking mode: The tracker provides positions when the device is moving. The reporting is done at
the chosen period (ul_period). The positions are acquired based on the geoloc_sensor geolocation
technology. If the device is not moving, heartbeat messages are sent regularly at the lora_period frequency.
Additional positions can be obtained by using the on-demand side operations features.
Note: Whatever the chosen geolocation policy, the first position is always established via a Wi-Fi one sent
immediately after the beginning of the motion.
Permanent tracking mode: The device reports its positions at ul_period frequency regardless the motion. It
uses the geoloc_sensor geolocation technology. Heartbeat messages are sent if there are no uplink message
during lora_period seconds.
Motion Start/End tracking mode: In this mode, position messages are sent twice at the start and at the end
of a motion (one Wi-Fi and one using the geoloc_sensor geolocation technology). The end of the motion is
detected when there is no movement detection for a period of 120 seconds.
Heartbeat messages are sent if there are no uplink message during lora_period seconds. Additional positions
can be obtained by using the on-demand side operations features.
Activity mode: This mode sends activity reports instead of positions. The tracker focuses on detecting
movements. Each shake detection increases a counter (after applying an integration period). The value of
the counter is reported up the LoRa link at the ul_period frequency. Heartbeat messages are sent if there are
no uplink message during lora_period seconds. Additional positions can be obtained by using the on-demand
side operations features.
Note: The accuracy of the different frequencies is not guaranteed as extra delay may be introduced by the
LoRa network duty cycle.
4.2 Side operations
Whatever the operating mode, optional messages can be sent according to the configuration. The side
operations can be:
Periodic position message: The device sends periodically its position at periodic_pos_period frequency.
Usually, this reporting frequency is very long. The position is sent three times (six if the device is moving).
Position on Demand: Position requests are done via LORA downlink message. The device answers with its
current position. The position is sent three times (six if the device is moving)
Notes:
➢ The geolocation strategy used in these cases is geoloc_method one
➢ The side operations can be cumulated.