I'm an easy guy, I don't ask for much. But I do ask for a timely call to a receive callback within 100 us of having gotten the UDP packet. How hard can it be??

Yes, very new to the Espressif SoCs and frameworks. Being in the POC phase of my project, I mainly want a low cost low-latency UDP Wifi solution, and as such, the ESP32s did look quite interesting. But maybe I need to look somewhere else.

I've tried to find WiFi related peripheral info in the ESP32-S3 technical reference manual, but there is zilch there. Anyone know where there is docs related to WiFi peripheral registers, IRQ and DMA?

Running tshark on the RPi5 I can see that the packets are timely delivered: rpi@rpi5:~ $ sudo tshark -i wlan0 Running as user "root" and group "root". This could be dangerous. Capturing on 'wlan0' ** (tshark:3893) 16:33:27.684476 [Main MESSAGE] -- Capture started. ** (tshark:3893) 16:33:27.684549 [M...

Running tshark on the RPi5 I can see that the packets are timely delivered: rpi@rpi5:~ $ sudo tshark -i wlan0 Running as user "root" and group "root". This could be dangerous. Capturing on 'wlan0' ** (tshark:3893) 16:33:27.684476 [Main MESSAGE] -- Capture started. ** (tshark:3893) 16:33:27.684549 [M...

Actually, when testing on the ESP32 again, but with UDP (iperf -u) I can get as high as 40+ Mbits/s. But I'm more interested to get a predictable and low latency between the UDP multicast packet sent, and the ESP32 receiving it. I need to verify though that the packets are sent as I think they are, ...

Yes, I tried the iperf (wifi) example and I get the following data running it (log is from AP which is on a RPi5): rpi@rpi5:~ $ iperf -s -i 3 ------------------------------------------------------------ Server listening on TCP port 5001 TCP window size: 128 KByte (default) --------------------------...

Did you ever get to the root cause? Because I am seeing something similar. Sending UDP packets every 2666us from a RPi, I get nowhere near 2666 us between received packets on the ESP32-S3.

I have a setup where I post UDP multicast packages from a RPi, then the AP does multicast-to-unicast and sends to clients (ESP32-S3). The RPi sends a packet each 2666 us (stably), but the ESP32 struggles to keep up. I'm using the udp_multicast server ESP-IDF example (IPv4). No other traffic on the A...