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just memo, NOT WORTH READING
+2015/11/24
+JP Bluetooth:
+ RN-42 cannot send Japanese keys like; henkan, mu-henkan and kana, JPY and RO.
+ It seems HID usage more than 0x65 cannot be send with the module.
+ http://shiki.esrille.com/2014/07/bluetoothnisse.html
+
+
Bug:
- Factory Reset PIO4 doesn't work
- the reason is unclear - 12/08 NOT LOOK INTO ANY MORE