OOB messages are transmitted periodically by devices. These transmissions are inherent to the Sigfox protocol stack.
They contain the following information about the device:
- Device temperature
- Battery voltage: VDD Idle and VDD Tx
Repeater devices also periodically send OOB messages to the backend which contain battery level and statistics of repeated messages.
All these messages are automatically decoded by the Backend upon reception.
OOB messages are not taken into account in the daily uplink messages count.