I've just made available an example whose code could be used in various application that use REST APIs and OAuth authentication.
It uses the HTTP Client Library that comes with the CC3200 SDK 1.1.0 and TI-RTOS for SimpleLink. All code is in C.
It performs the following steps:-
Obtains the current time from a SNTP server (this is required by TLS encyrption)
Obtain the OAuth 2.0 Authentication token from the Telstra API using HTTP GET over a secure TLS connection
Send an SMS message using the Telstra SMS API using HTTP POST over a secure TLS connection
There are many more details on