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Logic Machine Forum › LogicMachine eco-system › Scripting v
HifiBerry REST API

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HifiBerry REST API
Kai-Roger Offline
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Posts: 232
Threads: 57
Joined: May 2018
Reputation: 3
#1
09.05.2021, 14:28
Hi.

I normally control my HifiBerry amplifiers with NodeRed and the HifiBerry API. I now try to do the same with my LM5, but i just get an error code. I want to send % volume to the amplifier. Anyone here who knows what to adjust to get this to work?

Code:
http = require('socket.http')
ltn12 = require('ltn12')

body = require('json').encode({
  percent = event.getvalue()
})


res, code = http.request({
  url = 'http://192.168.1.91:81/api/volume',
  method = 'POST',
  headers = {
    ['Content-Length'] = #body,
  },
  source = ltn12.source.string(body)
})


log(res, code)


HifiBerry API documentation:
https://github.com/hifiberry/audiocontro...doc/api.md

Error:
* arg: 1
  * string:
    <!DOCTYPE HTML PUBLIC "-//IETF//DTD HTML 2.0//EN">
    <html>
        <head>
            <title>Error: 500 Internal Server Error</title>
            <style type="text/css">
              html {background-color: #eee; font-family: sans;}
              body {background-color: #fff; border: 1px solid #ddd;
                    padding: 15px; margin: 15px;}
              pre {background-color: #eee; border: 1px solid #ddd; padding: 5px;}
            </style>
        </head>
        <body>
            <h1>Error: 500 Internal Server Error</h1>
            <p>Sorry, the requested URL <tt>'http://192.168.1.91:81/api/volume'</tt>
              caused an error:</p>
            <pre>Internal Server Error</pre>
        </body>
    </html>

* arg: 2
  * number: 500
BR
Kai-Roger
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admin Offline
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Posts: 7284
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Joined: Jun 2015
Reputation: 417
#2
09.05.2021, 15:57
Try adding ['Content-Type'] = 'application/json' header
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Kai-Roger Offline
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Posts: 232
Threads: 57
Joined: May 2018
Reputation: 3
#3
09.05.2021, 16:15
(09.05.2021, 15:57)admin Wrote: Try adding ['Content-Type'] = 'application/json' header

Sorry. I can't find out where in the script i can add that line. I only get Lua syntax error.
BR
Kai-Roger
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Erwin van der Zwart Offline
Senior Member
Posts: 1745
Threads: 6
Joined: Jul 2015
Reputation: 114
#4
09.05.2021, 21:01 (This post was last modified: 09.05.2021, 21:03 by Erwin van der Zwart.)
headers = {
    ['Content-Length'] = #body,
    ['Content-Type'] = 'application/json',
  },
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Kai-Roger Offline
Member
Posts: 232
Threads: 57
Joined: May 2018
Reputation: 3
#5
09.05.2021, 21:18
(09.05.2021, 21:01)Erwin van der Zwart Wrote: headers = {
    ['Content-Length'] = #body,
    ['Content-Type'] = 'application/json',
  },

Thanks. I was sure that i tried that, but apparently not :)


Now i found a new problem. This part of the code did not work:
Code:
body = require('json').encode({
    percent = event.getvalue()
})

But this this works:
Code:
body = '{"percent":"30"}'

It would have been nice if i could use the event.getvalue.
BR
Kai-Roger
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admin Offline
Administrator
Posts: 7284
Threads: 40
Joined: Jun 2015
Reputation: 417
#6
10.05.2021, 06:30
Code:
body = require('json').encode({
  percent = tostring(event.getvalue())
})
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Kai-Roger Offline
Member
Posts: 232
Threads: 57
Joined: May 2018
Reputation: 3
#7
10.05.2021, 07:21
(10.05.2021, 06:30)admin Wrote:
Code:
body = require('json').encode({
  percent = tostring(event.getvalue())
})

Works :) Thanks for great support!
BR
Kai-Roger
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