PicoTCP is a fully featured TCP/IP stack designed for embedded devices and released under the terms of GNU GPL. Our purpose is to propose it as the reference TCP/IP stack for IoT, especially due to its high portability and modularity. This talk will explain the architecture of the stack, the way we have been developing it and the many features we support. Moreover, we will briefly show how easy it is to port the stack to a complete new architecture in no time. After the presentation, as a test scenario, we would like to show a demo illustrating how it is possible to transport MIDI flows over WiFi with a PIC24 based board using ZMTP protocol.