Mon bloc-notes

This ESP-IDF application initiates a connection to a Wi-Fi access point. Once the connection is established, it sends a UDP datagram to a remote IP address and port.

When the connection is lost, the application tries to reconnect on a periodic basis.

There are two takeaways in this sample application:

I have to check that the checksum of an IPv6 UDP packet is correct. Wireshark is one solution:

• write the UDP packet into a text file, adhering to the format described here
• in Wireshark, ensure that the checksum will be verified: select Edit > Preferences... > Protocols > UDP, and tick Validate the UDP checksum if possible
• import the packet, with File > Import from Hex Dump...
• for Encapsulation Type, select Raw IPv6

And that's it.