Implementing communication between edge devices and their server in IoT systems is often a tedious and bug-prone task, since different programming languages with distinct underlying paradigms need to cooperate. The mTask system prevents this semantic friction by providing a single task-oriented framework for the whole system. Shared data sources provide flexible communication between tasks running on the server and tasks running on edge devices, however the current implementation has some drawbacks. We introduce an improved version of these shares with a clearer semantics. To improve the communication between edge devices and the server, we introduce the possibility to start parametrized server tasks from the edge device.