Comments: SparkFun NanoBeacon Board - IN100 Hookup Guide

I follow the directions and the NanoBeacon is working. I can see it in the iPhone InPlay app. The ESP32 sketch is working and I can see the advertisements there. Then I try to modify the sketch to run non-blocking. Like this:

bool scanning = false;

void MyBLEScanResults(BLEScanResults results) {
    // Serial.println("MyBLEScanResults done");
    // Scan finished, delete results to release memory
    pBLEScan->clearResults();
    scanning = false;
}

void loop() {

    if (!scanning) {
        // the non-blocking version
        bool ok = pBLEScan->start((uint32_t)scanTime, &MyBLEScanResults, true);
        scanning = true;
    }
etc

And it doesn't work but that's not the complaint! Then I download the original sketch (the one in the article) and now IT doesn't work.

Then I try a fresh ESP32-WROOM-DA from my stash and it works with the article code. The one from before seems broken.

Is there a way to reset the esp32 or something?