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iOS retrieves information from a BLE (Bluetooth Low Energy) device using a process called communication protocol. The communication protocol works by establishing a connection between the iOS device and the BLE device using Bluetooth technology. Once the connection is established, the iOS device sends commands to the BLE device to request information such as a specific value, characteristic, or service. The BLE device then responds to these requests with the information requested by the iOS device. This information can include data such as sensor readings, battery level, device ID, or status codes. The iOS device can either retrieve this information periodically or on-demand, depending on the application's needs. The BLE device can also send data to the iOS device, which can be used to update the application or device settings.