Misc improvements + Alternative connection mode

[iranl]

Couple of small fixes/changes:

• Fix typo in setDisconnectTimeout
• Set TX power to max (9db) by default, based on https://github.com/h2zero/esp-nimble-cpp/blob/master/examples/Advanced/NimBLE_Client/main/main.cpp EDIT: Make TX power configurable
• Add extendDisconnectTimeout(); to remaining succesfully completed commands
• Better failure handling while obtaining references to the KeyTurner (Pairing) service, based on https://github.com/h2zero/esp-nimble-cpp/blob/master/examples/Advanced/NimBLE_Client/main/main.cpp

Add an alternative connection mode when NUKI_ALT_CONNECT is defined, based on https://github.com/h2zero/esp-nimble-cpp/blob/master/examples/Advanced/NimBLE_Client/main/main.cpp.

Issues reported on Nuki Hub Discord and Github point to dangling BLE connections with the current connect function of this library. The proposed alternative connection mode seems to fix these issues. By using this mode only when NUKI_ALT_CONNECT is defined aim for maximum compatibility while testing this mode on a larger group of users.

Edit: With the alternative connection mode the ESP32-C6 also seems stable (although it still won't pair, needs manual pairing)

[technyon]

Hi,

Are you sure increasing the TX power is necessarily a good idea? With radios, more isn't always better. Maybe we should make this configurable, it could really depend on the local environment of the user wether or not this makes sense.

[iranl]

Hi,

Are you sure increasing the TX power is necessarily a good idea? With radios, more isn't always better. Maybe we should make this configurable, it could really depend on the local environment of the user wether or not this makes sense.

Done