How to send HTTP SOAP request to local Sonos device with NodeMCU? - http

Question

How do I send a simple HTTP POST/GET SOAP request to my Sonos loudspeaker in Lua?
I have tried simple HTTP POST and GET requests with success, but I do not know where to start with SOAP requests.
Note: I am a newbie at this. I have never worked with a NodeMCU before nor have I programmed in Lua. I have experience in other languages though.
I know how to do it in C#, Java and PHP.
This works in Postman:
HTTP Headers:
SOAPAction:urn:schemas-upnp-org:service:AVTransport:1#Pause
Content-Type:text/xml; charset="utf-8"
Host:192.168.0.10:1400
BODY:
<s:Envelope xmlns:s="http://schemas.xmlsoap.org/soap/envelope/" s:encodingStyle="http://schemas.xmlsoap.org/soap/encoding/"><s:Body><u:Pause xmlns:u="urn:schemas-upnp-org:service:AVTransport:1"><InstanceID>0</InstanceID></u:Pause></s:Body></s:Envelope>
What I did is this and it does not work:
sendRequest("192.168.0.10")
function sendRequest(url)
print("Sending request to Sonos Playbar...")
sk = net.createConnection(net.TCP, 0)
sk:on("receive", function(sck, c) print(c) end )
sk:on("connection", function(sck, c)
print("\r\n\r\n\r\n")
-- HTTP 405: Method not allowed
-- sck:send("POST / HTTP/1.1\r\nHost: "..url..":1400\r\nConnection: keep-alive\r\nAccept: */*\r\n\r\n")
-- HTTP 500, UPnP 402: Invalid arguments
-- sck:send("POST /MediaRenderer/AVTransport/Control HTTP/1.1\r\nHost: "..url..":1400\r\nSOAPAction:urn:schemas-upnp-org:service:AVTransport:1#Pause\r\nConnection: keep-alive\r\n\r\nAccept: */*\r\n\r\n")
local content = nil;
content = "POST /MediaRenderer/AVTransport/Control\r\n"
content = content.."Host:192.168.0.10:1400\r\n"
content = content.."Content-Type:text/xml; charset=utf-8\r\n"
content = content.."SOAPAction:urn:schemas-upnp-org:service:AVTransport:1#Pause\r\n"
content = content.."\r\n"
-- SOAP Body
content = content.."<s:Envelope xmlns:s=\"http://schemas.xmlsoap.org/soap/envelope/\""
content = content.." s:encodingStyle=\"http://schemas.xmlsoap.org/soap/encoding/\">"
content = content.."<s:Body>"
content = content.."<u:Pause xmlns:u=\"urn:schemas-upnp-org:service:AVTransport:1\">"
content = content.."<InstanceID>0</InstanceID>"
content = content.."</u:Pause>"
content = content.."</s:Body>"
content = content.."</s:Envelope>"
-- SOAP Body End
print(content.."\r\n\r\n\r\n")
sck:send(content);
end)
sk:connect(1400, url)
end
I am getting this response of my Sonos player:
HTTP/1.1 500 Internal Server Error
CONTENT-LENGTH: 347
CONTENT-TYPE: text/xml; charset="utf-8"
EXT:
Server: Linux UPnP/1.0 Sonos/34.16-37101 (ZPS9)
Connection: close
<s:Envelope xmlns:s="http://schemas.xmlsoap.org/soap/envelope/" s:encodingStyle="http://schemas.xmlsoap.org/soap/encoding/">
<s:Body>
<s:Fault>
<faultcode>s:Client</faultcode>
<faultstring>UPnPError</faultstring>
<detail>
<UPnPError xmlns="urn:schemas-upnp-org:control-1-0">
<errorCode>401</errorCode>
</UPnPError>
</detail>
</s:Fault>
</s:Body>
</s:Envelope>
What am I doing wrong? I copied and paste the text, basically. Maybe it is the order of headers? Maybe I am declaring the headers wrong or something?

Answer 1

I don't have a Sonos device to play with. Thus, this ain't a confirmed answer.
The string in your content variable is not a valid HTTP request. Sonos doesn't understand it as the error code 401 means "invalid action".
You need the separate HTTP headers with \r\n. An extra \r\n needs to be placed right before the HTTP body. Therefore, I'd expect that your content should be:
"POST http://192.168.0.10:1400/MediaRenderer/AVTransport/Control\r\n
SOAPAction:urn:schemas-upnp-org:service:AVTransport:1#Pause\r\n
Content-Type:text/xml; charset=\"utf-8\"\r\n
Host:192.168.0.10:1400\r\n\r\n
<s:Envelope xmlns:s=\"http://schemas.xml......"

Answer 2

Finally! I have it working! Below is the code to get it working:
sendRequest("192.168.0.10")
function sendRequest(url)
print("Sending request to Sonos Playbar...")
local content = nil;
content = "";
-- SOAP Body
content = content.."<s:Envelope xmlns:s=\"http://schemas.xmlsoap.org/soap/envelope/\""
content = content.." s:encodingStyle=\"http://schemas.xmlsoap.org/soap/encoding/\">"
content = content.."<s:Body>"
content = content.."<u:Pause xmlns:u=\"urn:schemas-upnp-org:service:AVTransport:1\">"
content = content.."<InstanceID>0</InstanceID>"
content = content.."</u:Pause>"
content = content.."</s:Body>"
content = content.."</s:Envelope>"
-- SOAP Body End
http.post("http://"..url..":1400/MediaRenderer/AVTransport/Control",
'Content-Type: text/xml; charset="utf-8"\r\n'..
'Host:'..url..':1400\r\n'..
'SOAPAction:urn:schemas-upnp-org:service:AVTransport:1#Pause\r\n',
content, function(code, data)
if(code < 0) then
print("HTTP request failed with code "..code)
else
print(code, data)
end
end)
end