1. A robot system, comprising: at least one robot having: at least one transceiver configured to receive wireless signals from a building structure to determine a location of the robot within the building structure; a base having a moving mechanism configured to move the robot according to control instructions received in the robot, wherein: the base of the robot is configured to have a storage space to hold items for transportation within the building structure, and the base has a door or latch configured to secure the storage space from unauthorized access; a controller configured to: determine the location of the robot within the building structure based on the wireless signals, and control the moving mechanism to move the robot within a predetermined area along a pathway within the building structure in accordance with digital map data of the building structure; a body supported on the base; and a camera mounted on the body and controlled by the controller to capture photo images while traveling along the pathway; wherein the robot: receives an instruction from a server, wherein the instruction identifies a location within the building structure; travels to the location identified in the instruction; transports the items in the storage space from a store in the building structure to a centralized location in the building structure; takes a photo image of the surrounding of a point in the building structure while traveling to the location identified in the instruction, wherein the building structure at the point has a posted announcement captured by the photo image; and communicates the photo image to the server; wherein the server: receives the photo image from the robot; analyzes the photo image; identifies the announcement posted in the building structure and captured in the photo image; extracts information provided in the announcement from analyzing the photo image; generates content based on the information; and publishes, to a mobile application via an application programming interface (API), the content generated based on the information.