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3. Hello, World! Example Tutorial

This example demonstrates the basic Libtropic API and can be used to verify that the chip works correctly. In this example, you will learn about the following functions:

  • lt_init(): function used to initialize context for communication with the TROPIC01,
  • lt_verify_chip_and_start_secure_session(): helper function to start Secure Session and allow L3 communication,
  • lt_ping(): L3 command to verify communication with the TROPIC01,
  • lt_session_abort(): L3 command to abort Secure Session,
  • lt_deinit(): function used to deinitialize context.

Build and Run

Building and running the example

Go to the example's project directory: 

cd examples/linux/usb_devkit/hello_world/

Create a build/ directory and switch to it: 

mkdir build/
cd build/

And finally, build and run the example: 

cmake ..
make
./libtropic_hello_world

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After this, you should see an output in your terminal.

If your TROPIC01 has engineering sample pairing keys, you can switch to them using the LT_SH0_KEYS CMake option:

Switching to engineering sample pairing keys

You can pass LT_SH0_KEYS to cmake as follows: 

cmake -DLT_SH0_KEYS="eng_sample" ..
make

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Additionally, see Default Pairing Keys for a Secure Channel Handshake for more information.