We developed a 'Unified Communications Protocol' for our smart home back in 2005, when we realised we needed all of its elements to communicate using a common language. Essentially, it is a common format for events between all the elements of our smart home. Where we use 3rd party components that use other protocols, we use a 'wrapper' to expose them via our this unified communications protocol.
In December 2019, Amazon, Apple, Google, the ZigBee Alliance and a number of other organisations announced the Connected Home over IP project which aims to "to simplify development for manufacturers and increase compatibility for consumers" and it very well might achieve this but, it's primary (unstated) aim to to enable its members to increase their market share.