ESP32 Forum

Hi everybody.

Using the esp-idf/example/protocols/udp_multicast example and making simple mods I have a ServerESP32(is set as AP) and a ClientESP32(set as a STA connected to the Other ESP32).

A multicast message from the client to the server is received without any losses, but sending a message from the Server to the Client there is a terrible loss, 90% or more.

If I set both ESP32 to Client and use a standard router AP, 100% of packets are received in both ESP32s.

I have tried many things but same result. Read somewhere in forum that there seems to be a limitation/error(unreported) were the AP has limitations with Multicast messages.

Any ideas, hints.

Regards.

Please try disabling Wi-Fi modem sleep (which is enabled by default) using esp_wifi_ps_set function. Perhaps this will improve the situation?

Hi Esp_igrr:

Spot On!!!!. Works like a charm now. Not going to ask why just happy it works.

Regards

For the benefit of clarity,

esp_wifi_set_ps(WIFI_PS_NONE);

in the InitWiFi setup routine in both the Client and Server.

That wifi sleep thing is impacting people in multiple ways. Maybe you should change the default back to none and make a point of telling people who want low power to change it with the possible unwanted side effects.

John A