Efento SP. J.
Ul.Krupnicza 14/5
31-123 Kraków
● APN settings – some networks require manual APN set up. Please contact your operator and
obtain APN configuration. Set APN with Efento Logger as described in Step 4.
● If the device is able to fetch time from the network - Efento loggers need to fetch the time from
the NB-IoT network in order to synchronize internal time with the network time. If this feature is
not available, you can set the time manually with Efento Logger by using the “Change device
time” option.
● Temperature in which logger operates – If the temperature is below the range declared in the
datasheet, the logger will not be able to send the data over NB-IoT. This is due to the voltage
required by the NB-IoT module. If you need to measure low temperatures, please use the logger
with an external temperature probe
Other problems
If you experience any other problems with Efento NB-IoT loggers, please contact our support team. We
will be happy to assist you.
Appendices
Security
Wireless communication via the Bluetooth Low Energy interface can be encrypted. If the encryption is
turned on, then mobile devices that do not have an encryption key compatible with the key, with which
the communication is encrypted cannot read any data sent by the logger. Additionally, it is possible to
automatically turn off the Bluetooth Low Energy interface after the desired time from starting the logger.
Thanks to this, it will not be possible to connect to the logger using devices equipped with the Bluetooth
Low Energy interface.
Data transmission in the NB-IoT network is encrypted and therefore safe. The data security problem
appears at the stage of data transfer via the Internet - between the NB-IoT network and Efento Cloud /
user server. NB-IoT is based on the UDP protocol, which is supposed to be lightweight. Adding security
features to this protocol (e.g. encryption) increases the size of sent UDP frames, and thus the device's
battery consumption. The solution that ensures safe data transmission from the logger to the server is
the use of an APN configured by the network operator and a secure tunnel (VPN) configuration between
the APN and Efento Cloud / client's server. Then the data is still sent using the light UDP protocol,
without increasing energy consumption, and thanks to the use of a tunnel, it cannot be eavesdropped on
during its transmission over the public Internet.
Power saving features
In order to ensure maximum battery saving, the logger is set to PSM = 0, eDRX = disabled. This means
that the device will finish the transmission automatically after sending data to the server and (possibly)
receiving a new configuration from it. The device does not stay awake waiting for additional transmission
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