Correct, vcom_Init() initialises the UART for outputting messages on your 'virtual comport' (as in: show debug information). The UART works under DMA, and even uses a message queuing function to allow your application to continue doing other stuff wh...
There is a 'Release_Notes.html' file in the .zip file that briefly lists the most prominent changes. But if you want a more detailed overview of what is fixed, have a look at https://github.com/Lora-net/LoRaMac-node/issues?q=is%3Aissue+is%3Aclosed . ...
