This might get tricky if I want to continously send data over WiFi and also have to think about roaming. If I have to do an esp_wifi_scan_start() every 1-5s, just to see if there is maybe an AP with the same SSID but with a better RSSI in reach, I'd assume that I can't send any data while the scan i...

I'm just wondering if there are any news regarding WiFi roaming?
Is this still down to programmatically scanning SSIDs and deciding upon the RSSI value if I want to switch to another AP?

Thank you very much, I was not aware I can choose the core my task is running at.
This solves all my questions

Assuming i2s_read() is on thread A and the output via http is on thread B.
Both threads do not run at the same time, but only consecutively.
So you still und up with thread B not running because it needs to wait for the blocking call of i2s_read() in thread A to complete.

There are various examples how to read from an I2S microphone. eg: https://github.com/maspetsberger/esp32-i2s-mems However, they all are using i2s_read() https://docs.espressif.com/projects/esp-idf/en/latest/api-reference/peripherals/i2s.html#_CPPv48i2s_read10i2s_port_tPv6size_tP6size_t10TickType_t ...