the sleep(UINT32_MAX) has exited on OpenWRT instantly

[halfbakery]

The sleep(UINT32_MAX) has exited instantly on OpenWrt. This fix will work forever :-)

[halfbakery]

I forgot to mention, that sleep(INT32_MAX) is working correctly, only the greater values are problematic. It's definetly not a busy loop. The for loop around the sleep is just some extra pedantry:

• serial2mqtt could run longer than than 68 years :-)
• theoretically signal handlers could interrupt sleep (currently we don't use signal handlers, but this solution is future proof)

If you have any concerns, please let me know.

[halfbakery]

Or we can use a more idiomatic way:

for (;;)
{
    pause();
}