I have the Bittle X with bluetooth on-board. I can pair my bittle x but when I go to more Bluetooth options, the incoming/outgoing ports are blank. I have factory reset, updated the firmware, deleted and re-paired... Nothing I have tried makes it show those ports. This is needed for Mind+ so that I can communicate with that port.
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For the Bluetooth connection issue, please refer to:
https://docs.petoi.com/bluetooth-connection