Global interoperability is probably the biggest problem that smart devices have been studied for more than 10 years. Multiple solutions have been proposed with different results, but none of them has established a reference framework and a global adoption. One of the main reasons for this to stay as a key element for research and investment is the diversity among the whole technology stack and geographical dispersion of device manufacturers. In the last years, there is a solution that is capturing the attention by demonstrating how an open source operating system can enable global interoperability in a huge domestic market like China. This solution is OpenHarmony and through a cooperation with Eclipse Foundation Oniro project, it is intended to use open source to drive interoperability and therefore solve one of the biggest challenges in the IoT and smart device industry. During the talk, it will be presented the approach followed by these two independent initiatives to cooperate while keeping the independence of the open source communities behind them.