This paper presents the PiccSIM Toolchain: a graphical user interface with design tools for the network and control co-simulation platform PiccSIM. The proposed tool-chain enables easy network and control design and improved co-simulation via an integrated graphical user interface. It supports implementation of the simulated algorithms on actual wireless sensor network nodes. The developments presented here include automatic network configuration script generation for the ns-2 network simulator, control design and tuning tools, and automatic code generation from Simulink models to wireless sensor nodes. It also summarizes several improvements to the PiccSIM simulation tool, such as network and control simulation synchronization, and extensions, e.g., network indoor shadowing model, done to the platform.