My solution will be to crowbar the ESP32 supply source, 9V. What does that mean? He/She means to simply short-circuit the 9volt supply ! Not sure I would recommend that since any power source for these chips is going to be able to supply a good amount of current, so who knows what may happen I'm su...

^^^
yes, as boarchuzsays

yield() is a FreeRTOS function so abides by the rules: it gives control back to the scheduler

What are you trying to achieve exactly ? You presumably have one set of LED's but have 3 tasks trying to each send them a different sequence of patterns all at the same time? I'm no expert on FreeRTOS, but I don't believe you should be using delay() function in a task as it will lock-out the schedul...

Does the maufacturer of the Bluetooth Speaker mention anything in their sales literature that it can do this ? It may be a good start to say which one you actually have I doubt there's an agreed communication protocol for this, so it needs someone to have a working setup and then listen-in on the co...

OK, proviso, I'm new to ESP32.... I don't believe you need to make any changes to the sd.* files Just use the code as per your link Connect sdCard to vspi pins: //SCLK = 18, MISO = 19, MOSI = 23, SS = 5 and connect your sensor to hspi pins: //SCLK = 14, MISO = 12, MOSI = 13, SS = 15 or, you can choo...

OK, I'm new to ESP32, so this may be wrong ! I believe you may need a new board configuration in the boards.txt file At the end of the compile, it gives a % used of program & data (RAM) The figure for data matches the board config line (WROVER board shown): esp32wrover.upload.maximum_data_size=32768...

With standard UART, data can be (validly) sent, but, if nothing is waiting at the other end to receive it, will simply disappear...

I believe the only reliable way to know if the data was sent is if you get the receiver to reply back confirming it has been received

I think it's a bit more simple than that ...

for (int i; i < n; i++)
change to:
for (int i=0; i < n; i++)
might fix it