If you don't put an "end of string" marker ('\0') in your buffer, the string in the buffer continues until it reaches a \0. If you send "1234" followed by "AB" the buffer will contain the string "AB34".
If you don't put an "end of string" marker ('\0') in your buffer, the string in the buffer continues until it reaches a \0. If you send "1234" followed by "AB" the buffer will contain the string "AB34".