Micro Tracker Reference Guide FW 1.7 V1.1
Page 6 of 39
11th october 2018
Restricted distribution
4
Functioning
4.1
Main operating modes
This section describes the different operational modes supported by the trackers.
OFF mode:
The tracker is in deep low power mode. No uplinks are sent in this mode. A long button press is
required to wake it up. Three possibilities to set the tracker in OFF mode:
➢
User action (long button press, if bit1 of
config_flags
is set)
➢
Low battery
➢
Downlink request
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
side operations
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.
End of motion is validated when the device hasn’t moved for 2 minutes.
When the device is static, only heartbeat messages are sent at the chosen period (
lora_period
). (like in
standby mode)
Note:
1-
Whatever the chosen geolocation policy, the first position is always a WIFI 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.
Note:
1-
Having regular position can also be obtained using standby mode + side operation periodic position
See section
Example
to have an example of configuration
Motion Start/End tracking mode
: In this mode, position messages are sent (
motion_nb_pos
+1)
times at the start and the end of a motion (one WIFI plus
motion_nb_pos
times using the
geoloc_sensor
geolocation technology). The end of the motion is detected when there is no movement during 120 seconds.
Heartbeat messages are sent if there are no uplink message during
lora_period
seconds.
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 via the LoRa link at the
ul_period
frequency. Heartbeat messages are sent if there are
no uplink message during
lora_period
seconds.
Notes
:
1-
The accuracy of the different frequencies is not guaranteed as extra delays may be introduced by
the LoRa network duty cycle.
2-
In all these modes, side operation can be used to obtain additional positions