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Only 11 payload bytes are available when operating at DR0 in the 902-928 band. This can create a conflict with an aggregate
count greater than one, as the sensor cannot fit all the sensor data into the packet. In this case the sensor sends the last
sensor reading to the LoRa server and logs the remaining data to FLASH. A flag is set in the uplink message notifying the
server of the configuration error. It is the responsibility of the server to update the sensor configuration to use an aggregate
count of one if it is desired not to backlog data in this case.
Minimum and maximum alarm levels may be set for both temperature and humidity. When an alarm is triggered, the sensor
immediately sends the data to the server. Thereafter it resumes sending data at its normal frequency based on the sensor
read period and aggregate count. If the alarm condition persists, the sensor again sends the alarm message in one hour,
ensuring the server is aware of the condition.
In addition, setting alarm levels puts sensor backlog data into a separate section of FLASH so that it may be prioritized during
backlog retrieval.
The first LED indicator is used for LoRa status (see Figure 1 ). The device can be configured to flash a LED based on the LoRa
network status. A green LED flash indicates that the device is connected to the LoRa network server, an orange LED flash
indicates that the device is not connected to the LoRa network server. See the
Sensor Configuration section of this guide.
The second LED indicator is used for Bluetooth. The device can be configured to flash a blue LED when the device is
connectable, or advertising. See the Sensor Configuration
section of this guide.
The LoRa network server can request the sensor firmware version from the sensor.
Reset the sensor by holding down the Bluetooth button for a minimum of five seconds.