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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.
## Client Demo example
Here is an example to show how to get data from iiodevices with the demo client.
### Launch afb-client-demo
First, launch the client demo with right port and right TOKEN, the example below
matches with ff(6.x) AGL version.
``` bash
afb-client-demo ws://localhost:1055/api?token=HELLO
```
### Subscribe to acceleration
Here is a list of different examples to subscribe to acceleration data.
#### Subscribe to acceleration with x,y and z axis with a frequency of 0.1 Hz
``` bash
iiodevices subscribe { "event": "acceleration", "args": "xyz", "frequency": "0.1" }
```
#### Subscribe to acceleration with x and z axis
``` bash
iiodevices subscribe { "event": "acceleration", "args": "xz" }
```
Events will be sent each time a new value is available (sent by iiodevice).
### Unsubscribe to acceleration
``` bash
iiodevices unsubscribe { "event": "acceleration" }
```
## Remaining issues
- Provide a json file to configure the device name and the channel name.
- Handle several values simultaneously, see triggers.
- Update this binding for other iiodevices.
- Only read channel values at the maximum frequency.
- Change args values into json arrays.
## 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.
## Tests dependencies
### Kernel modules
To use industrial I/O dummy device we need to load kernel modules :
* industrialio
* industrialio-configfs
* industrialio-sw-device
* industrialio-sw-trigger
* iio-trig-hrtimer
* iio_dummy
[documentation](https://github.com/analogdevicesinc/libiio/blob/master/examples/dummy-iiostream.c)
[recipe](https://gerrit.automotivelinux.org/gerrit/gitweb?p=AGL/meta-agl.git;a=blob_plain;f=meta-agl-bsp/recipes-kernel/linux/linux-agl.inc)
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