Insteon All-Link Control Flags

For whatever reason it is difficult to locate the breakdown of the Insteon All-Link Control Flags.

Link Control Flags:
Bit 7: 1 = Record is in use, 0 = Record is available
Bit 6: 1 = Controller (Master) of Device ID, 0 = Responder to (Slave of) Device ID
Bit 5: 1 = ACK Required, 0 = No ACK Required (currently always set to 1)
Bit 4: Reserved
Bit 3: Reserved
Bit 2: Reserved
Bit 1: 1 = Record has been used before (‘high-water’ mark)
Bit 0: Unused

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