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sensors/sentrius-bt7x0-tracker-multi-sensor
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Figure 3
– BLE operations in Active mode
When in Active mode, the tracer sequences through a series of BLE operations continuously including Scan, Advertise, and
Connected. The Scan Interval parameter determines how much time passes between scan events, at which point the tracer
awakes from sleep and performs a BLE scan (discovery of other tracers) for a number of seconds defined by the Scan
Duration parameter. At each scan interval, the status LED blinks to indicate the tag is scanning (see the LED Patterns section
for details on LED blink patterns).
When not connected, the tracer advertises (transmits) data for other tracers to receive when scanning. The rate of transmit
events when performing the Advertise operation is determined by the Ad Interval parameter.
The advertisement data contains identifiers to help filter out non-tracer devices, including device ID, TX power, and other
status information. Flags in the advertisement indicate to gateway devices when a tracer has log data ready for download.
The tracer hardware uses a red/green status LED to indicate operating behavior to the user. The following table (
describes the LED patterns used to indicate status.
Table 1: Status LED Blink Patterns
LED
Status LED Behavior
Description
Slow flashing yellow
Internal clock is not set, connect to mobile app or bring the tag near a
gateway to automatically set it
Fast flashing yellow
When holding the button for 10+ seconds, fast yellow flash indicates
release of the button will perform a factory reset
Green on startup
The status LED shows green briefly as part of the startup sequence
indicating the tag is running BT710 tracer firmware
Fast flash green
Green flash indicates the tag is scanning for presence of nearby tags
Three green flashes
Three quick green flashes indicates the data log is full
Three red flashes
Three quick red flashes indicates the battery is low
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