  With the advent of blockchain-enabled IoT applications, there is an increased
need for related software patterns, middleware concepts, and testing practices
to ensure adequate quality and productivity. IoT and blockchain each provide
different design goals, concepts, and practices that must be integrated,
including the distributed actor model and fault tolerance from IoT and
transactive information integrity over untrustworthy sources from blockchain.
Both IoT and blockchain are emerging technologies and both lack codified
patterns and practices for development of applications when combined. This
paper describes PlaTIBART, which is a platform for transactive IoT blockchain
applications with repeatable testing that combines the Actor pattern (which is
a commonly used model of computation in IoT) together with a custom Domain
Specific Language (DSL) and test network management tools. We show how
PlaTIBART has been applied to develop, test, and analyze fault-tolerant IoT
blockchain applications.
