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# IIODEVICES Service
## Overview
The iiodevices service provides access to data from industrial i/o devices.
For now it permits to get data from acceleration, gyroscope and electronic compass.
## General Scheme
As soon as a client subscribes to the agl-service-iiodevices binding,
the binding reads values from the sensors and sends it to subscribers as events.
Subscribers can choose their frequency and indicate what values they want at
subscription.
## Verbs
| Name | Description | JSON Parameters |
|:-------------------|:--------------------------------------------|:--------------------------------------------------------------- |
| subscribe | subscribe to 9 axis events | *Request:* {"event": "acceleration", "args":"xy", "frequency": "10" }|
| unsubscribe | unsubscribe to accelero events | *Request:* {"event": "acceleration" } |
## Events
For now, there are 3 different events matching with the different available sensors.
* "acceleration": is for acceleration data
* "gyroscope": is for gyroscope data
* "compass": is for electronic compass data
## Frequency
The frequency is in Hertz, if the frequency is not set, events are triggered via a file descriptor.
## Remaining issues
- Provide a json config file so that it configures the device name and the channel name.
- Handle several values simultaneously, see triggers.
- Update it to other iiodevices.
- only read channel values at the maximum frequency.
## M3ULCB Kingfisher
M3ULCB Kingfisher is equipped with a 9 axis sensor device (LSM9DS0) and the R-Car Starter
Kit can read sensor values via I2C interface and iiodevices are provided for
these sensors.
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