Function heartbeat

src/microham.c:719–727

send a heartbeat and record time The "last heartbeat" time is recorded in a global variable such that the service thread can decide whether a new heartbeat is due.

// heartbeat is due.
//
static void heartbeat()
{
    unsigned char seq[2];

    seq[0] = 0x7e;
    seq[1] = 0xfe;
    writeControl(seq, 2);
    lastbeat = time(NULL);
}
#endif /* defined(HAVE_SOCKETPAIR) && defined(HAVE_SELECT) */