Security / automation system control panel with short range communication disarming

1. A method comprising:

transmitting, by a short range communication radio in a control panel, a first short range communication signal that comprises a byte sequence and is configured to cause a device that is within range of the control panel to generate a first hash of the byte sequence with a shared secret and a Media Access Control (MAC) address of the device;

receiving, by the control panel, a second short range communication signal transmitted by the device that is within range of the control panel, the second short range communication signal comprising the first hash;

determining, by the control panel, that the device that is within range of the control panel is a known device responsive to recognizing the MAC address of the device;

generating, by the control panel, a second hash of the byte sequence with the shared secret and the MAC address of the device, responsive to recognizing the MAC address of the device; and

automatically disarming the control panel responsive to determining that the first hash received from the device that is within range of the control panel matches the second hash generated by the control panel.

2. The method of claim 1 , wherein the short range communication radio comprises a Bluetooth radio.

3. The method of claim 1 , wherein the short range communication radio comprises a Bluetooth low energy “BLE” radio.

4. The method of claim 1 , wherein the short range communication radio comprises a near-field communication “NFC” radio.

5. The method of claim 1 , wherein determining whether the device is the known device comprises determining whether the device is registered with the control panel as the known device.

6. The method of claim 5 , wherein the short range communication radio comprises a Bluetooth radio, the method further comprising registering the device with the control panel by pairing the control panel with the device using the Bluetooth radio in the control panel.

7. The method of claim 1 , further comprising unlocking, by the control panel, an entrance of a premises responsive to recognizing the device as the known device.

8. The method of claim 7 , wherein unlocking the entrance of the premises comprises sending, by a Z-wave radio in the control panel, a Z-Wave command to a door lock at the entrance of the premises.

9. The method of claim 1 , wherein the device comprises a smartphone of a user associated with a premises monitored by the control panel.

10. The method of claim 1 , further comprising using the short range communication radio to pair one or more security or automation sensors of a security or automation system with the control panel.

11. The method of claim 1 , further comprising controlling, by the control panel, responsive to recognizing the device as the known device, an operation of one or more security or automation devices at a premises according to a stored user configuration, preference, habit, or historical pattern associated with the known device.

12. A control panel comprising:

a memory; and

a processor communicatively coupled with the memory and configured to:

transmit, by a short range communication radio in the control panel, a first short range communication signal that comprises a byte sequence and is configured to cause a device that is within range of the control panel to generate a first hash of the byte sequence with a shared secret and a Media Access Control (MAC) address of the device;

receive, by the control panel, a second short range communication signal transmitted by the device that is within range of the control panel, the second short range communication signal comprising the first hash;

determine that the device that is within range of the control panel is a known device, responsive to recognizing the MAC address of the device;

generate, by the control panel, a second hash of the byte sequence with the shared secret and the MAC address of the device, responsive to recognizing the MAC address of the device; and

automatically disarm the control panel responsive to determining that the first hash received from the device that is within range of the control panel matches the second hash generated by the control panel.

13. The control panel of claim 12 , wherein the short range communication radio comprises a Bluetooth radio.

14. The control panel of claim 12 , wherein the short range communication radio comprises a Bluetooth low energy “BLE” radio.

15. The control panel of claim 12 , wherein the short range communication radio comprises a near-field communication “NFC” radio.

16. The control panel of claim 12 , wherein, in order to determine whether the device is the known device, the processor is configured to determine whether the device is registered with the control panel as the known device.

17. The control panel of claim 16 , wherein the short range communication radio comprises a Bluetooth radio, wherein the processor is further configured to register the device with the control panel by pairing the control panel with the device using the Bluetooth radio in the control panel.

18. The control panel of claim 12 , wherein the processor is further configured to unlock an entrance of a premises responsive to recognizing the device as the known device.

19. The control panel of claim 18 , wherein, in order to unlock the entrance of the premises, the processor is configured to send, by a Z-wave radio in the control panel, a Z-Wave command to a door lock at the entrance of the premises.

20. A non-transitory computer-readable medium storing instructions executable by a processor, wherein the instructions, when executed, cause the processor to:

transmit, by a short range communication radio in a control panel, a first short range communication signal that comprises a byte sequence and is configured to cause a device that is within range of the control panel to generate a first hash of the byte sequence with a shared secret and a Media Access Control (MAC) address of the device;

receive, by the control panel, a second short range communication signal transmitted by the device that is within range of the control panel, the second short range communication signal comprising the first hash;

determine that the device that is within range of the control panel is a known device responsive to recognizing the MAC address of the device;

generate, by the control panel, a second hash of the byte sequence with the shared secret and the MAC address of the device, responsive to recognizing the MAC address of the device; and

automatically disarm the control panel responsive to determining that the first hash received from the device that is within range of the control panel matches the second hash generated by the control panel.

21. The non-transitory computer-readable medium of claim 20 , wherein, in order to determine whether the device is the known device, the instructions, when executed, cause the processor to determine whether the device is registered with the control panel as the known device.