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Returns the length of the C string str. The length of a C string is determined by the terminating null-character: A C string is as long as the number of characters between the beginning of the string and the terminating null character (without including the terminating null character itself). Source: http://www.cplusplus.com/reference/cstring/strlen/

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Arduino to arduino serial communication without a library

Taking strlen of such string techically is an Undefined Behaviour, and all bets are off. … It means that the loop for(int i=0; i<strlen(s); i++){ hozcheck += s[i]; } is in fact infinite, and the program neve got a chance to send anything. …
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