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  • Having similar issues, I've been setting NRF Services and trying to save the code getting disconnects. I've manged to do a reset ( insert battery, hold button, wait for self test to finish ) then ran your code above and tried a save() ... disconnected. I think only the last part of the log is the interesting part "BT> SEND ERROR: NotSupportedError: GATT operation failed for unknown reason."

    BT> Sending "s"
    BT> Sent
    BT> RX:"s"
    BT> Sending "a"
    BT> Sent
    BT> RX:"a"
    BT> Sending "c"
    BT> Sent
    BT> RX:"c"
    BT> Sending "v"
    BT> Sent
    BT> Sending "e"
    BT> RX:"v"
    BT> Sent
    BT> RX:"e"
    BT> Sending "\b"
    BT> Sent
    BT> RX:"\b \b"
    BT> Sending "\b"
    BT> Sent
    BT> RX:"\b \b"
    BT> Sending "\b"
    BT> Sent
    BT> RX:"\b \b"
    BT> Sending "v"
    BT> Sent
    BT> RX:"v"
    BT> Sending "e"
    BT> Sent
    BT> RX:"e"
    BT> Sending "("
    BT> Sent
    BT> RX:"("
    BT> Sending ")"
    BT> Sent
    BT> RX:")"
    BT> Sending "\r"
    BT> SEND ERROR: NotSupportedError: GATT operation failed for unknown reason.
    Disconnect callback...
    WARNING: [notify_warn] Disconnected
    >>> Disconnected
    
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