MAC address for the access point name is in reversed byte order

[SubOptimal]

@Tutmanichtun reported following issue openbikesensor/openbikesensor.github.io#161

"SSID ist die MAC-Adresse des Gerätes OpenBikeSensor-xxxxxxxxxxxx."
...
Zur Erzeugung der SSID wird von der MAC-Adresse 1 abgezogen, die einzelnen MAC-Blöcke Gruppenweise gespiegelt und Nullen am Anfang weggelassen. Zwei Beispiele:
| WiFi-SSID | MAC |
| OpenBikeSensor-378B25BF58 | 58:BF:25:8B:37:01 |
| OpenBikeSensor-E040A71AD6B8 | B8:D6:1A:A7:40:E1 |

[SubOptimal]

@amandel According to the documentation [1] the SoftAP MAC is +1 to the base MAC (which is returned by ESP.getEfuseMac()). Which would be the valid case for the OpenBikeSensor.

The question which arise is. Should the SSID of the ConfigServer access point contain the base MAC or the SoftAP MAC?

Using the base MAC would have the benefit that it could be queried for the board easily by esptool.py read_mac.

What would be your opinion?

If we go for the SoftAP MAC a possible solution can be seen on [2].

[1] https://espressif-docs.readthedocs-hosted.com/projects/esp-idf/en/stable/api-reference/system/system.html#mac-address
[2] SubOptimal@d04b6f7

[amandel]

Getting the mac address of a network device should be an easy task for the people needing it. Using the ESP.getEfuseMac() or a part of it in the SSID, was an approach to get a unique SSID even, if there are multiple OpenBikeSensors around. It was not meant to expose the MAC via the SSID as the documentation suggested. This then lead to openbikesensor/openbikesensor.github.io#161.

I'm fine to change this as in your PR, we might ask in a Monday meeting or here if changing the SSID will cause problems. Assuming the hot spot mode is only used in initial setup (not via https://install.openbikesensor.org/), this should not affect many users.

#141 is related.