Rapid and Repeated: E NimBLEClient: Connection failed; status=574 Connection Failed to be Established about nimble-arduino

[h2zero]

Have you tried using a different esp32? some boards have crystals that aren't quite up to spec and get out of sync quickly.

[Panometric]

Thanks for getting back, actually I made some progress. I had these commented out in the scanner, because I did not think they were needed if using scan callbacks:

	//pBLEScan->setInterval(1349); 
	//pBLEScan->setWindow(449);

So I was getting zeros. Turns out if the window is zero, it makes it very difficult to connect. The examples are all over the place, but after tracking it down the default esp-idf value is 16 to get 10 ms. And if you want all the bandwidth used for BLE, the Window should be equal to the interval.

So an improvement might be to default them both to 16, and standardize the examples.