We’d like to share photos to SNS, ex. FB via the camera whose OS system is ThreadX RTOS.
But we cannot find any SDK resource for ThreadX RTOS system.
Could we have any chance to share phtots to FB via ThreadX RTOS system?
Facebook's API is based on structured HTTP calls, you could write code to interact with it in any language with a networking stack; the documentation should be applicable to any language you're using, though it will probably reference Facebook's PHP or Javascript SDK in the examples.
Your biggest problem will be authentication, which requires a web browser with internet access on the device for the user to log in and grant access to your application; if you can find a way to do that, you shouldn't have other problems with the API