pythonraspberry-pi3wiringpi

How to send a char array over serial which includes a NULL char?

I am using WiringPi-Python to send data over serial and trying to send a char array. My problem is; I cannot send the data if the array includes a 0 (NULL char).

bytes = [112, 52, 0, 18]
send = "".join(map(chr, bytes))
wiringpi.serialPuts(serial, send)

How can I pass a NULL contained char array to serialPuts?

Solution

  • IMHO the problem is in bindings.i of the library:

    serialPuts() is defined as

    extern void serialPuts (const int fd, const char *s) ;

    and in C, strings (char*) are terminated by the \0 character. I consider that a bug of the library. It should be

    extern void serialPuts (const int fd, const char *s, int strlen) ;

    Try wiringpi.serialPutchar() in a loop.