Scanner accesses 'reserved' I2C addresses

[Tech-TX]

From at least rev 2.0 of the spec (I don't have < rev 2), up to current rev 6:
https://www.nxp.com/docs/en/user-guide/UM10204.pdf page 17, 3.1.12 Reserved addresses,
the bottom 8 and top 8 addresses are reserved for special purposes. Following that, line 38 is:

	  for (address = 8; address < 120; address++ )  {

Additionally, for more reliable operation with slow slaves on the ESP8266 using the software wire library, I'd add Wire.setClockStretchLimit(500); or higher just after the Wire.begin(); as the default stretch limit is very short (230uS). I've seen people pushing that up to 1500us for some parts due to the non-static nature of the 8266 wire library. The ESP32 has a different library with a much longer timeout, so it doesn't need this. I've set my code to 1500us default clock stretch limit until I get hold of a fully-static 8266 library done more like the Arduino library.

Just after Wire.begin(portArray[i], portArray[j]); at line 27 add

#ifdef ESP8266
Wire.setClockStretchLimit(500);  //may need to increase this to 1500us for very slow parts
#endif