The engineering of Internet of Things applications always requires more and more devices to be connected and collaborate in a secure and trusted environment. However, this is not always possible unless considering the adoption of alternative technologies such as blockchain. For this reason, the development of blockchain-based IoT applications is gaining even more interest both in industry and academia. Nevertheless, the combination between IoT and blockchain is perceived as a time and resource-consuming activity, making the development more complex. In such a context, a model-driven approach can overcome such an issue by automating the implementation phases. This paper presents an approach for the development of choreography-driven blockchain-based IoT applications. In particular, it shows the feasibility of the approach in practice by developing a Smart Thermostat scenario.