GetHTTPData in Wiser

Hi guys.

I'm wanting to use the GetHTTPData and related commands in a Wiser project, but it's not supported for the platform - only the C-Touch Colour.

Other TCP/IP network functions (like SendEMail) are available, so just wondering why the HTTP-based functions are not. Slated for sometime, or never?

Thanks in advance,
Steve.

 

New piced firmware supports this now for wiser..

Wiser Firmware History
Version 1.30.0
Improve string handling memory utilization for ReadClientSocket
Implement support for PostHTTPData, ReadHTTPPostData, GetHTTPData, and ReadHTTPData in Logic
Improve robustness of port forwarding when handling CTCs behind Wiser
24738 - tag database error if Schedule with Scene is edited on Wiser using Adobe Flash UI and then project is retrieved from unit
Fix bug that was limiting number of client sockets to 3 rather than 4
Fix bug that was limiting WriteClientSocket and WriteServerSocket to 30 byte strings

Cheers..

 

You little bloody ripper! Thanks for posting, Roosta.

 

Hey..

Did you manage to get this to work in the wiser? I have been trying to utilise the HTTP functions but no joy!!!

Cheers..

 

What are you seeing? Any errors? Wireshark the connection if possible as that would help reveal what's happening.

Here's are the examples I have which do http get from a web page and then parse a string out of it to display in a system io, the other does a http post and then the same. These work fine on my unit. I hope it helps:
GetHTTPData('http://192.168.100.246/index.html');
// wait for data to come back
delay(5);
// read the data into a string
ReadHTTPData(DataString);
if DataString <> '' then
begin
// Find where the data starts and ends
DataStart := pos('forecast is', DataString) + 12;
DataEnd := pos('</body>', DataString);
// extract the data into the string ForecastString
Copy(TheFirstNameString, DataString, DataStart, DataEnd - DataStart);
SetStringSystemIO("showsomething", DataString);
end;

PostHTTPData('http://192.168.100.246/cgi-bin/hello.cgi',
'fname=John&lname=Doe');
// wait for data to come back
delay(5);
// read the data into a string
ReadHTTPPostData(DataString);
if DataString <> '' then
begin
// Find where the data starts and ends
DataStart := pos('First name: ', DataString) + 12;
DataEnd := pos('</p>', DataString);
// extract the data into the string TheFirstNameString
Copy(TheFirstNameString, DataString, DataStart, DataEnd - DataStart);
SetStringSystemIO("showsomething", DataString);
end;

 

Hey Kjayakumar..

Yer its strange.. My code is below.. I transfered exactly the same code onto a ctc mk2 connected it to the LAN and works a treat.. So unsure what the go is..

Cheers..

 

I believe for Wiser, you have to call ReadHTTPPostData as well as there is no guarantee that PostHTTPData completes all of its work in a single call. CTC has a more powerful engine and so there are multiple threads servicing tasks. Wiser has only a single thread so if the socket connection and POST send did not complete in the PostHTTPData, it will only be completed during the ReadHTTPPostData call. I think that's a constraint that's Wiser specific. I'll ask that this be documented.

 

Thanks Kjayakumar..

Could you give me an example snippet of code that I should/could try using the readHTTP command in reference to what i am trying to do?

Cheers..

 

Sure. I would do:
once (GetLightingState("IP Cam Pos1") = ON) then
Begin
PostHTTPData('http://10.1.1.33:1900/decoder_control.cgi?command=31&user=admin&pwd=','' ); {Command to send camera to preset 1}
Delay("0:00:01");
{ Would be better to call read in a while loop until data is received but for simplicity, just call it a couple of times }
ReadHTTPPostData(DataString);
Delay("0:00:01");
ReadHTTPPostData(DataString);
SetLightingState("IP Cam Pos1", OFF);
End;

 

Kjayakumar.. Thanks so much.. It worked a treat.. :-D

Although I dont quiet understand why, or what the read command does..

Cheers..

 

I can explain what I know. Short story, the read is intended to get the data output generated by the server.

Long story. The first post call doesn't guarantee that the data got to the server. This is because there are multiple things that the post needs to do that can take a lot of time beyond what would be acceptable for a logic function. This includes converting a DNS name to an IP, connecting and establishing a connection to that IP, then sending the http post data to that IP. So what Wiser does is just start the task in the first post call. It tries to convert the name, connect to the IP, if it doesn't finish in time, it doesn't stop the task but instead shelves it to be done later when the readhttppostdata is called. The expectation here is that typical operation would be like this:
- PostHTTPData to send some HTTP POST command and parameters to a server
- keep calling ReadPostHTTPData to get the servers complete response and/or complete any incomplete tasks in PostHTTPData

Hope that helps.