| CPC H04M 1/72415 (2021.01) [G07C 9/00309 (2013.01); G07C 9/00571 (2013.01); H04L 63/0428 (2013.01); H04L 63/0492 (2013.01); H04L 63/08 (2013.01); H04W 12/06 (2013.01); H04W 12/08 (2013.01); H04W 12/50 (2021.01); G07C 2009/00365 (2013.01); G07C 2009/00412 (2013.01); G07C 2209/64 (2013.01); H04W 12/64 (2021.01); H04W 12/77 (2021.01)] | 20 Claims |

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17. A non-transitory computer-readable medium storing instructions which, when executed, cause performance of a method by an access control device of a secured premises, the method comprising:
receiving, at the access control device, a command that instructs the access control device to enable access to the secured premises by a first entity, wherein the command is received by the access control device from a server computer after receipt by the server computer of an authentication code from a mobile device associated with the first entity, and wherein the authentication code is used by the server computer to authenticate the first entity before communication by the server computer of the command to the access control device;
after the command is received at the access control device, causing broadcast of a communication signal adjacent the access control device via a short-range wireless communication protocol;
receiving a response via the short-range wireless communication protocol from the mobile device that indicates reception of the signal by the mobile device;
in response to the access control device determining that the mobile device is proximate to the access control device; and
after the access control device receives the command, enabling, by the access control device, access to the secured premises after determining that the mobile device is proximate to the access control device and an authorization to access the secured premises has been granted to the first entity by a second entity with administrative status associated with the secured premises.
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