![]() Pairing usually requires an authentication process where a user must validate the connection between devices. The also share a common secret key, which allows them to bond whenever they're together in the future. When devices pair up, they share their addresses, names, and profiles, and usually store them in memory. No UI interactions are required!īonds are created through one-time a process called pairing. When I start up my car, for example, the phone in my pocket immediately connects to the car's Bluetooth system because they share a bond. Bonded devices automatically establish a connection whenever they're close enough. When two Bluetooth devices share a special affinity for each other, they can be bonded together. A master can command a slave to "park", and that slave will become inactive until the master tells it to wake back up. Park Mode - Park is the deepest of sleep modes.The master can command a slave device to hold. Hold Mode - Hold mode is a temporary, power-saving mode where a device sleeps for a defined period and then returns back to active mode when that interval has passed.It'll sleep and only listen for transmissions at a set interval (e.g. Sniff Mode - This is a power-saving mode, where the device is less active.Active Mode - This is the regular connected mode, where the device is actively transmitting or receiving data.While connected, a device can either be actively participating or it can be put into a low power sleep mode. Connection - After a device has completed the paging process, it enters the connection state.Before this connection can be initiated, each device needs to know the address of the other (found in the inquiry process). Paging (Connecting) - Paging is the process of forming a connection between two Bluetooth devices.One device sends out the inquiry request, and any device listening for such a request will respond with its address, and possibly its name and other information. Inquiry - If two Bluetooth devices know absolutely nothing about each other, one must run an inquiry to try to discover the other.Connection ProcessĬreating a Bluetooth connection between two devices is a multi-step process involving three progressive states: Sometimes the unique digits of the address might be included in the name to help differentiate devices. They can be up to 248 bytes long, and two devices can share the same name. ![]() The rules for device names are less stringent. ![]()
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