Are the HCI commands of Bluetooth, standard or vendor specific?

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I've seen various command formats for Bluetooth operation in accordance with the HCI. Does the HCI commands of Bluetooth changes from Vendor to Vendor or constant to all vendors?

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HCI commands are part of Bluetooth specifications. Those can be found on: www.bluetooth.com

So basically all HCI commands specified there must be supported by vendor to be approved by the Bluetooth organization.

However, it's not prohibited for a vendor to add his own specific commands which are not part of the specification.