Binary reads from STDIN / Serial file descriptors
Posted: Thu Jun 09, 2016 12:17 pmHey all!
I'm trying to figure out how to properly read binary data coming from the ESP8266 module and send it via WiFi (TCP).
In any other C based system, I'd so something like the following:
However, my 'read' call keeps returning -1 and doesn't block itself, as I thought it should.
Am I missing any kind of initialization on 'stdin'?
Also, I've noticed that, whenever I connect to the module via TCP, the created client socket descriptor has the value '1'. I thought the descriptors 0,1 and 2 were reserved for stdin, stdout and stderr, respectively...? In fact, <unistd.h> actually defines them as such.
My apologies if I'm missing any obvious detail here!
Thanks in advance.
I'm trying to figure out how to properly read binary data coming from the ESP8266 module and send it via WiFi (TCP).
In any other C based system, I'd so something like the following:
Code: Select all
ret = read(STDIN_FILENO, serial2wifiBuffer, length);However, my 'read' call keeps returning -1 and doesn't block itself, as I thought it should.
Am I missing any kind of initialization on 'stdin'?
Also, I've noticed that, whenever I connect to the module via TCP, the created client socket descriptor has the value '1'. I thought the descriptors 0,1 and 2 were reserved for stdin, stdout and stderr, respectively...? In fact, <unistd.h> actually defines them as such.
My apologies if I'm missing any obvious detail here!
Thanks in advance.