Answer
How do I turn OFF BT Classic?
Use the SBTP command (User Guide Page 183) to disable Bluetooth Classic discoverability (and therefore connections).
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Set D = 0 → BT Classic not discoverable
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(Recommended) Also set C = 0 → not connectable
Example: SBTP, D=0 C=0
When BT Classic is not discoverable and not connectable, it is effectively turned off.
How do I turn OFF BLE?
Use the .CYSPPSP command (User Guide Page 170) to disable the BLE CYSPP profile.
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Set E = 0 → Disable BLE
Example: .CYSPPSP, E=0
This stops BLE advertising and connections.
For further information refer to EZ-Serial User Guide.