Hi,

I want to know if it's possible to know when the uart has transmitted the data out of the interface.

My experience is that uart write method buffers the data, but I need to know the exact moment that there are no more bytes to send so I can toggle a GPIO. One way is to make write method blocking, which I understand is not possible.

I was trying to see if the native API offer additional control over this so I can write my low level app in C++ but it seems there is no additional uart core support different than AT API.

Will appreciate your comments,