User will receive the OnSDKReady callback once the SDK is initialised.
Ensure that the Sending and receiving methods are called only after the onSDKReady is received.
The first time app is initialised, SDK makes a call to the TrillService to register your device. Network connection is required by TrillSDK to make this api call only during this call. After this, your SDK is ready to be used for sending and receiving data.