ESP-IDF UDP sender

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:

Created on 30-Jul-2020 - Updated on 30-Jul-2020 - 349 views

ESP-IDF Ruuvi tag advertising data receiver

This ESP-IDF application receives and decodes advertisement data transmitted by a Ruuvi tag.

Created on 29-Jun-2020 - Updated on 29-Jun-2020 - 743 views

How to check the checksum of an IPv6 UDP packet

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.

Created on 15-Jun-2020 - Updated on 17-Jun-2020 - 879 views

VirtualBox: USB basics and troubleshooting

An interesting thread about USB, in VirtualBox forum.

The solution which I already used twice: in my Linux host, add the user to vboxusers group.

Created on 03-Mar-2020 - Updated on 25-Mar-2020 - 1811 views

Architecture of a web browser

Created on 15-Nov-2019 - Updated on 15-Nov-2019 - 2480 views

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