Shouldn’t the highlighted word be actually bolt users ?
The Bolt users could have one or more Bolt devices under them. Each device could be used for specific purposes. Each device is treated as a separate entity irrespective of the other devices under the same user. Hence I feel that devices is the appropriate term for the above paragraph.
Hey even i am also confused like you but both the words “Bolt devices” and “Bolt users” can be used.
Read the line “request for sensor data from Bolt devices” which means the bolt cloud receives commands which request for sensor data which is present on the particular bolt device.
But here word “Bolt devices” suites better because it is specifying about from where does the sensor data coming from.