Unable to POST to Things speak channel using TELIT LE910 Modem

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Rani H on 1 Jan 2020

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https://uk.mathworks.com/matlabcentral/answers/498578-unable-to-post-to-things-speak-channel-using-telit-le910-modem

Commented: Rani H on 6 Jan 2020

I want to POST to thingspeak channel using Telit LE910 modem. Able to successfully execute GET command to the same channel. From browser able to successfully POST data.

Tried following combination for posting data in both online mode and command mode, getting 400 Bad Request as response:

Online mode:

01/01/20 11:31:31>>>: AT#SSLD= 1,443,"api.thingspeak.com",0,0

01/01/20 11:31:33<<<:

01/01/20 11:31:33<<<: CONNECT

01/01/20 11:31:45>>>: POST /update HTTP/1.1<CR><LF>Host: api.thingspeak.com<CR><LF>Connection: close<CR><LF>X-THINGSPEAKAPIKEY: XXXXXXXXXXXXXXXX<CR><LF>Content-Type: application/x-www-form-urlencoded<CR><LF>Content-Length: 144<CR><LF><CR><LF>field1=111&field2=111111111111::11:11:11:11:11:11::O &field3=1111&field4=111111111111::111.1::11::XXXX XXX &field5=02.111111,11.111111&field6=11

01/01/20 11:31:51<<<: HTTP/1.1 400 Bad Request

01/01/20 11:31:51<<<: Server: awselb/2.0

01/01/20 11:31:51<<<: Date: Wed, 01 Jan 2020 06:01:50 GMT

01/01/20 11:31:51<<<: Content-Type: text/html

01/01/20 11:31:51<<<: Content-Length: 138

01/01/20 11:31:51<<<: Connection: close

01/01/20 11:31:51<<<:

01/01/20 11:31:51<<<: <html>

01/01/20 11:31:51<<<: <head><title>400 Bad Request</title></head>

01/01/20 11:31:51<<<: <body bgcolor="white">

01/01/20 11:31:51<<<: <center><h1>400 Bad Request</h1></center>

01/01/20 11:31:51<<<: </body>

01/01/20 11:31:51<<<: </html>

01/01/20 11:31:52<<<:

01/01/20 11:31:52<<<: NO CARRIER:SSL,1

Following is working response for GET command:

01/01/20 11:29:25>>>: AT#SSLD= 1,443,"api.thingspeak.com",0,0

01/01/20 11:29:26<<<:

01/01/20 11:29:26<<<: CONNECT

01/01/20 11:29:50>>>: GET /update?api_key=XXXXXXXXXXXXXXXX HTTP/1.1

Host: apithingspeak.com

01/01/20 11:29:56<<<: HTTP/1.1 200 OK

01/01/20 11:29:56<<<: Date: Wed, 01 Jan 2020 05:59:56 GMT

01/01/20 11:29:56<<<: Content-Type: text/plain; charset=utf-8

01/01/20 11:29:56<<<: Content-Length: 4

01/01/20 11:29:56<<<: Connection: keep-alive

01/01/20 11:29:56<<<: Status: 200 OK

01/01/20 11:29:56<<<: X-Frame-Options: SAMEORIGIN

01/01/20 11:29:56<<<: Access-Control-Allow-Origin: *

01/01/20 11:29:56<<<: Access-Control-Allow-Methods: GET, POST, PUT, OPTIONS, DELETE, PATCH

01/01/20 11:29:56<<<: Access-Control-Allow-Headers: origin, content-type, X-Requested-With

01/01/20 11:29:56<<<: Access-Control-Max-Age: 1800

01/01/20 11:29:56<<<: ETag: W/"545fae2efd81862725c43a539e2936f3"

01/01/20 11:29:56<<<: Cache-Control: max-age=0, private, must-revalidate

01/01/20 11:29:56<<<: X-Request-Id: ef5ce9f0-8c7a-4aea-b718-8baf8e1e24d9

01/01/20 11:29:56<<<: X-Runtime: 0.035532

01/01/20 11:29:56<<<: X-Powered-By: Phusion Passenger 4.0.57

01/01/20 11:29:56<<<: Server: nginx/1.9.3 + Phusion Passenger 4.0.57

01/01/20 11:29:56<<<:

01/01/20 11:30:08>>>: 4184

Command mode:

01/01/20 11:47:12>>>: AT#SSLD= 1,443,"api.thingspeak.com",0,1

01/01/20 11:47:14<<<:

01/01/20 11:47:14<<<: OK

01/01/20 11:47:27<<<: AT#SSLSEND=1

01/01/20 11:47:44>>>: GET /update?api_key=XXXXXXXXXXXXXXXX HTTP/1.1

Host: apithingspeak.com

01/01/20 11:47:44<<<:

01/01/20 11:47:45<<<:

01/01/20 11:47:45<<<: OK

01/01/20 11:47:45<<<:

01/01/20 11:47:45<<<: SSLSRING: 1,648,HTTP/1.1 200 OK

01/01/20 11:47:45<<<: Date: Wed, 01 Jan 2020 06:17:45 GMT

01/01/20 11:47:45<<<: Content-Type: text/plain; charset=utf-8

01/01/20 11:47:45<<<: Content-Length: 4

01/01/20 11:47:45<<<: Connection: keep-alive

01/01/20 11:47:45<<<: Status: 200 OK

01/01/20 11:47:45<<<: X-Frame-Options: SAMEORIGIN

01/01/20 11:47:45<<<: Access-Control-Allow-Origin: *

01/01/20 11:47:45<<<: Access-Control-Allow-Methods: GET, POST, PUT, OPTIONS, DELETE, PATCH

01/01/20 11:47:45<<<: Access-Control-Allow-Headers: origin, content-type, X-Requested-With

01/01/20 11:47:45<<<: Access-Control-Max-Age: 1800

01/01/20 11:47:45<<<: ETag: W/"2e311bdd3398de229dfc25107ce4c394"

01/01/20 11:47:45<<<: Cache-Control: max-age=0, private, must-revalidate

01/01/20 11:47:45<<<: X-Request-Id: 5bf33cc9-5df0-4f96-87ac-4a483836566d

01/01/20 11:47:45<<<: X-Runtime: 0.094855

01/01/20 11:47:45<<<: X-Powered-By: Phusion Passenger 4.0.57

01/01/20 11:47:45<<<: Server: nginx/1.9.3 + Phusion Passenger 4.0.57

01/01/20 11:47:45<<<:

01/01/20 11:47:45<<<: 4185

01/01/20 11:48:12<<<: AT#SSLSEND=1

01/01/20 11:48:40>>>: POST /update HTTP/1.1<CR><LF>Host: api.thingspeak.com<CR><LF>Connection: close<CR><LF>X-THINGSPEAKAPIKEY: XXXXXXXXXXXXXXXX<CR><LF>Content-Type: application/x-www-form-urlencoded<CR><LF>Content-Length: 144<CR><LF><CR><LF>field1=111&field2=111111111111::11:11:11:11:11:11::O &field3=1111&field4=111111111111::111.1::11::XXXX XXX &field5=02.111111,11.111111&field6=11

01/01/20 11:48:40<<<:

01/01/20 11:48:40<<<: OK

01/01/20 11:48:41<<<:

01/01/20 11:48:41<<<: SSLSRING: 1,288,HTTP/1.1 400 Bad Request

01/01/20 11:48:41<<<: Server: awselb/2.0

01/01/20 11:48:41<<<: Date: Wed, 01 Jan 2020 06:18:41 GMT

01/01/20 11:48:41<<<: Content-Type: text/html

01/01/20 11:48:41<<<: Content-Length: 138

01/01/20 11:48:41<<<: Connection: close

01/01/20 11:48:41<<<:

01/01/20 11:48:41<<<: <html>

01/01/20 11:48:41<<<: <head><title>400 Bad Request</title></head>

01/01/20 11:48:41<<<: <body bgcolor="white">

01/01/20 11:48:41<<<: <center><h1>400 Bad Request</h1></center>

01/01/20 11:48:41<<<: </body>

01/01/20 11:48:41<<<: </html>

01/01/20 11:48:41<<<:

01/01/20 11:50:11<<<:

01/01/20 11:50:11<<<: NO CARRIER:SSL,1

Kindly Guide how to post data

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Vinod on 5 Jan 2020

Your request seems to have spaces(' ') in the request. This needs to be URL Encoded. So, a space (' ') needs to become %32.

Based on what is shared, this is not a correctly encoded HTTP request and I'd recommend using POSTMAN to first get the request correct before embedding it in your device.See the "Use POSTMAN to Wite Data with POST" example.

Rani H on 6 Jan 2020

Thanks for your suggestion.I had tried Posting data using 'POST HTTP Requests Online', which worked. Same thing i posted to Telit modem. I will try POSTMAN.

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Unable to POST to Things speak channel using TELIT LE910 Modem

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