Port 22?

In the Vexcode “vex_global.h” library, the normal 21 available ports are defined. However, there is also a port 22 defined:
extern const int32_t PORT22;
If port 22 is used it doesn’t throw any errors or return any special information from the terminal.

I’m not sure if this invisible port has a function or it is there for some other reason.
Does anyone know what function it has or why it is defined?


The ADI in the V5 is implemented on an internal port 22 with its own processor. I’m assuming this is so that the protocol / general electrical design can be reused for an external ADI, whenever that happens.