retry bme

src/BME280.cpp

@@ -15,11 +15,15 @@ bool BME280::begin(void) {
   digitalWrite(23, HIGH);  // enable bme280 CS
   delay(50);
   bme = new Adafruit_BME280(BME_CS, BME_MOSI, BME_MISO, BME_SCK); // software SPI
+  int retries = 0;
   while (!(status = bme->begin())) {
+    if (retries > 5) break;
+    retries++;
     Serial.println("Could not find a valid BME280 sensor, check wiring!");
 //    bme->reset();
     delay(500);
   }
+  if (!status) return false;
   return true;
 }