Are you storing audio data at the ESP before sending it via WiFi? Do you have a SD card or Flash for this or do you use LittleFS / SPIFFS for the memory of the ESP or do you sent the audio as stream directly from the ESP?
Are you storing audio data at the ESP before sending it via WiFi? Do you have a SD card or Flash for this or do you use LittleFS / SPIFFS for the memory of the ESP or do you sent the audio as stream directly from the ESP?