Azure Sphere HTTP Client C Code Example?

Question

Does anyone have any leads on a tutorial or example code for using the Azure as an HTTP Client with C code?

In my past, I've successfully used C++ on Linux microcontrollers to act in part as an HTTP Client to hit APIs such as Darksky or Nest. I attempted to port the code to the Azure C environment and its definitely tedious - leaving me to think there are probably some Visual Studio references that could readily be used instead.

Thanks,

Sean

peterfenn · Accepted Answer

Sean There are some HTTP related projects under Microsoft Azure Sphere samples: https://docs.microsoft.com/en-us/azure-sphere/resources/sample-links https://github.com/Azure/azure-sphere-samples -Peter

Sean_Miller · Answer

Was able to get the example HTTPS client code to work. Had it hit www.google.com with success. However, api.darksky.net and the Nest Thermostat API gave this error Connected to firebase-apiserver17-tah01-iad01.dapi.production.nest.com (52.4.203.41) port 9553 (#0)
* successfully set certificate verify locations:
* CAfile: /mnt/apps/011b3254-6b4e-4af1-bc81-22e7f677f4bf/certs/DigiCertGlobalRootCA.pem
 CApath: /etc/certs/
* ALPN, offering http/1.1
* CA signer not available for verification
* Closing connection 0
curl_easy_perform (curl err=77, 'Problem with the SSL CA cert (path? access rights?)') Looks like I need to read up on SSL certificates to sort this one out. Looks like I have to find a way to generate a new .pem file that will be acceptable by the nest server, in the above case. Things that make you say "hmmmm???" See ya', Sean

peterfenn · Answer

Sean

Not sure why you are bumping into this. The most efficient way to get quick resolution on this is to:
a) Summarize the issue as succinctly as possible and
b) Post this to the Microsoft MSDN Azure Sphere forum,
...that way we can get Microsoft specialist resources in the loop to advise

Here's the link:
https://social.msdn.microsoft.com/Forums/en-US/home?forum=azuresphere

-Peter

peterfenn · Answer

Did you update your app_manifest.json file with the URL of the website you are accessing? ie.

Sean_Miller · Answer

For the JSON Parser, I found a lightweight one is already part of the AvnetStarterKitReferenceDesign solution. Here is it's GitHub: https://github.com/kgabis/parson One less thing. :-) Sean

Azure Sphere HTTP Client C Code Example?

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