MKRNB - read()
Reads UDP data from the specified buffer. If no arguments are given, it will return the next character in the buffer.
This function can only be successfully called after NBUDP.parsePacket().
- buffer: buffer to hold incoming packets (char*)
- len: maximum size of the buffer (int)
- b: the characters in the buffer (char)
- size: the size of the buffer
- -1: if no buffer is available