Thanks for the suggestion. :) "tcpip_api_call( )" is a private function and not accessible from outside of the lwip code as far as I can tell. I tried to copy the design pattern used by the other dns functions that use an IPC call to do essentially the same thing I think? Here is what I added to esp...

A word of CAUTION! Since posting, I've spent a good part of the last week trying to track down a bug. I'm pretty sure its come from me including dns_clear_cache()! :( If I call dns_clear_cache() from another thread while my MQTT (over tls) connection is busy connecting it causes the MQTT thread to l...

This is an old thread and I haven't properly tested this, but if someone else comes across this you can try: #include "lwip/dns.h" Which includes this function: dns_clear_cache(void); NOTE: there is only one DNS client shared between all interfaces (at least on IDF4.4). If you have WiFi/Cell/Eth run...

Thanks for the tip oarcher I'm still using IDF 4.x but I'll be making that leap to 5.x at some point I hope, so I'll take a look at this when I get there! You've probably saved me trying to implement it myself! :D I see there is a whole section here: https://docs.espressif.com/projects/esp-protocols...

Opened an issue: https://github.com/espressif/esp-idf/issues/12849

Just found an issue with this! TAKE CARE IF YOU HAVE COPIED THIS CODE! There is a difference in implementation between IDF 4.3 and IDF 4.4 The older code includes the custom section of the retain memory in the CRC calculation and the newer one skips it. Which is causing me compatability issues when ...

Thanks ESP_Sprite, Sounds like jumping straight to second stage bootloader is a bad idea. I'm assuming that a reset of any kind will also re-initialise system registers such as RTC scratch values in the first/second stage bootloader? Reserving RAM is how I would normally tackle this, but I think the...

Hi Everyone, I am struggling a bit with finding a way to manually launch the second stage bootloader from a running application partition. My code implements a custom serial bootloader using bootloader hooks and it would be nice to be able to force launch it. I also use OTA, but the serial backup is...

I think I have found my issue. Amongst the numerous other things I have going on... I have manually overridden the IP4 route src hook functions. I do this to be able to force a default interface based on internet connectivity rather than solely on link up status. E.g. It will prefer WiFi if it has W...

Thanks for having a look hmalpani.

You are right, the example seems to work. I'll keep digging and report back. I'm still pretty sure it is getting stuck in this function, but must be some other mechanism.

Thanks.