Well, I've just found out why the "Invalid file descriptor" was generated. I
didn't stop the "read watcher" when creating the "write watcher".
So, I just maintain my second question:
What's the most convenient way to write data in a TCP socket:
1.- "send" data directly in the read callback
2.- Create a write watcher
3.- Create a watcher of both types: READ&WRITE.
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