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# Radio Service
## Overview
Radio Service allows tuning of rtl-sdr based devices to radio stations and receive
respective audio stream.
## Verbs
| Name | Description | JSON Parameters |
|:-------------------|:-------------------- -----------------------|:---------------------------------------------------------------|
| subscribe | subscribe to radio events | *Request:* {"value": "frequency"} |
| unsubscribe | unsubscribe to radio events | *Request:* {"value": "frequency"} |
| frequency | get/set tuned radio frequency | *Request:* {"value": 101100000} |
| band | get/set current band type (e.g. AM, FM) | *Request:* {"band": "FM"} *Response:* {"band": "FM"} |
| band_supported | check if a certain band is supported | *Request:* {"band": "FM"} *Response:* {"supported": 1} |
| frequency_range | get frequency range for band type | *Request:* {"band": "FM"} *Response:* {"min": ..., "max": ...} |
| frequency_step | get frequency step/spacing for band type | *Request:* {"band": "FM"} *Response:* {"step": 200000} |
| start | start radio playback | |
| stop | stop radio playback | |
| scan_start | start scanning for station | *Request:* {"direction": "forward" or "backward"} |
| scan_stop | stop scanning for station | |
| stereo_mode | get/set stereo or mono mode | *Request:* {"value": "stereo" or "mono"} |
## Events
### frequency Event JSON Response
JSON response has a single field **frequency** which is the currently tuned frequency.
### station_found Event JSON Response
JSON response has a single field **value** of the frequency of the discovered radio station.
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