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https://github.com/christophberger/auxin-switcher-for-3sixty

Switch a 3sixty radio to AUX-IN when a Raspi starts playing music.
https://github.com/christophberger/auxin-switcher-for-3sixty

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Switch a 3sixty radio to AUX-IN when a Raspi starts playing music.

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# AUX-IN Switcher for the Teufel 3sixty Radio



## Problem



- A 3sixty radio from Teufel - **no, this part is not the problem!**

- The radio has lot of cool features but no AirPlay

- And the Spotify client has a few issues (or maybe it's only my local net, but anyway...)



## Solution



- A Raspberry Pi with shairport-sync and raspotify connected to the auxiliary input



## Now I have a new Problem!



- I want to **auto-switch** the 3sixty to the aux input when the Raspi starts playing. Because I am lazy, and standing up, walking 2 steps over to the radio and hitting the Source button a few times is not an option.



## New Solution



Luckily,



- The 3sixty has a Frontier Silicon chipset.

- Frontier Silicon built a REST-like HTTP API into the chipset. (It's only REST-**like** and no standard REST but who cares.)



So - 



- I wrote a Go program that detects music output on a Raspi.

- If music starts playing, the program then 

  - wakes up the 3sixty if needed,

  - saves the currently active source, 

  - and switches the radio to aux-in.

- If music stops playing, the program

  - checks if the radio was switched to a different source in the meantime

  - if so, the program leaves the radio alone

  - else it switches back to the previous source

  - and puts the radio into standby mode.



The Go code started out from code generated by Postman.



The Postman queries I built were based on [this inofficial FSAPI doc](https://github.com/flammy/fsapi/blob/master/FSAPI.md).



Detecting if the Raspi plays music is easy once you [find out how]((https://howchoo.com/linux/how-to-detect-that-audio-is-currently-being-output-in-linux-and-use-it-to-call-a-program#create-an-audio-output-monitor-script)) - `cat /proc/asound/card1/pcm0p/sub0/status` is the command line version. 



Go code compiles to a single binary with no dependencies. And Go can cross-compile to a different architecture without the need for installing the target system's compiler toolchain locally. These attributes of Go make it super easy to `scp` the program to the Raspi and run it as a `systemd` service. No complicated build/deploy routines needed (but setting up the `systemd` files is still a manual step; templates included in the repo). 



## Disclaimer



I built this project for my own purposes (obviously) but I am happy to share it here in case anybody else has a 3sixty (or some other Frontier Silicon based radio) and wonders how to auto-switch to aux-in in case a Raspi plays music.



## Instructions



If you really want to build this app for your own use (no guarantees that it will work outside my particular setup), follow these steps.



1. Ensure you have [Go](https://go.dev) installed.

2. Clone the repo.

3. If you do this already on the target Raspi: run `go build` and move the binary to `/usr/local/bin/` (sudo required)

4. Else run `GOOS=linux GOARCH=arm go build && scp 3sixty [email protected]:/home/pi/` (given your Raspi user is `pi`)

   Then `ssh` into your Raspi and move the binary to `/usr/local/bin` (sudo required)

5. Edit 3sixty.conf and 3sixty.service as needed. (Required: base URL to your radio & access PIN)

6. Move 3sixty.conf to /etc/ and 3sixty.service to /etc/systemd/system

7. Run `sudo systemctl daemon-reload` 

8. Run `sudo systemctl start 3sixty && sudo systemctl status 3sixty`

9. To auto-start the service after system boot, run `sudo systemctl enable 3sixty`

10. Check the status - it should be "active (running)"

11. If the service fails, check `/var/log/syslog`