The reason timeouts would sometimes happen before the abstime deadline was due
to rounding errors converting the timeout to milliseconds, and also because
vTaskDelay(1) only delays until the next tick which is less than one full tick
period.
Closes https://github.com/espressif/esp-idf/issues/6901
Force linking pthread implementation from IDF, instead of the weak
functions provided by gthread library. Previously this would either
work or not depending on the linking order.
Thanks @bpietsch for suggesting the fix.
Closes https://github.com/espressif/esp-idf/issues/3709
1. separate rom include files and linkscript to esp_rom
2. modefiy "include rom/xxx.h" to "include esp32/rom/xxx.h"
3. Forward compatible
4. update mqtt
