Bob Assistant - Reference Manual
2023-04-04 - Version 1.0
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7.21.
Is it possible to check the activity and proper functioning of BoB
ASSISTANT on request?
No. In its nominal operation, BoB ASSISTANT sends a report every 3 hours, and real-time alerts in case
of unexpected events (vibration alarm, machine off...)
7.22.
What is the range of BoB ASSISTANT (communication distance) in an
industrial environment?
The LoRa modulation is dedicated to the transmission of short messages, at low transmission frequencies
and over long distances. In free space (no obstacles) this range can reach several kilometers (up to 14km).
On the other hand, in an industrial environment, various metal equipment and structures are obstacles
that create electromagnetic interference and reflections that can reduce BoB ASSISTANT's radio
performance and range to a few hundred meters.
When a gateway is installed, the range in an industrial environment can go down between 50m to 500m
7.23.
Are the transmitted data secure?
The data is encrypted using 2 layers of AES-128 encryption. This encryption is natively supported by the
LoRaWAN protocol, as the payload is encrypted using a first key (AppSKey = Application Session Key) and
the LoRaWAN header plus the encrypted payload are encrypted using a second key (NwkSKey = Network
Session Key).
The session keys are derived from a symetric private key during the join session.
7.24.
I started BoB ASSISTANT, but no message arrives on the application
Check that the network coverage is sufficient, and refer to the user manual to learn more about the LED
sequences displayed by the sensor during startup.
Contact your integrator, platform provider to make sure that everything is ok on the Network Server
and/or application platform declaration.
7.25.
How do I position BoB ASSISTANT on my machine?
It is recommended to position BoB ASSISTANT on a flat and clean surface, as close as possible to the
vibration source:
- On "simple" equipment (motor, pump, compressor): place BoB ASSISTANT directly on the equipment.
- On "complex" equipment: place BoB ASSISTANT on the chassis.
You can put your hand on the surface to feel the vibration.
FIRST MAKE SURE THAT THE SURFACE
TEMPERATURE OF THE EQUIPMENT DOES NOT PRESENT A DANGER
