Hi,
I am using lwip as part of the espressif/arduino-esp32 library and there is something I don't understand.
If I understand correctly there is a lookup table, which contains the host names, which have been queried before and their ip adress. Can I add a host to that lookup table during runtime?
So what I want is this: The ESP32 wakes up and only does the DNS query (dns_gethostbyname), if the IP address of an MQTT server has changed, because an IP change of that server is not likely to happen often. So I would save the IP address over deep sleep and use it again, when the ESP wakes up. Do I need a dynamic host list for that (the DNS_LOCAL_HOSTLIST macro is undefined now)? Or can I edit the lookup table directly?
Best,
Roman