Bluetooth Low Energy Controller   tws earbuds wireless

device discovery
Bluetooth Low Energy devices discover other devices through the broadcast channel. As shown in Figure 7-17, one device broadcasts while the other scans. There are 4 different types of broadcasts: generic, directed, unconnectable, and discoverable. Every time the device broadcasts, it will send the same message on the 3 broadcast channels. These packets are called a broadcast event. Except for directional packets, other broadcast events can be selected at intervals ranging from 20ms to 10.28s. Typically, a device in a broadcast will broadcast every second. The time between broadcast events is called the broadcast interval. The host can control this interval. However, there is a problem with devices that periodically send broadcasts: because the clocks between the devices will drift to varying degrees, two devices may broadcast at the same time for a long period of time and cause interference. To prevent this from happening, the sending time of other broadcast events other than directional broadcasts will be perturbed. The way to achieve this disturbance is to add a random delay of 0~10ms after the last broadcast event. This means that even if two devices collide with the same broadcast interval and send on the same channel and time, they will most likely not collide when they send the next broadcast event. http://www.bjbjaudio.com/  <a style="opacity:0.0;color:#ffffff">tws earbuds wireless</a>

Scanning is an important part of Bluetooth Low Energy advertising. Scanning is used to receive broadcast events. Scan time depends on how much time is spent scanning and how quickly other devices need to be discovered. For example, if a user taps the screen to search for a device, the scan can last for a few seconds, and it can wipe out all the devices that are broadcasting in a certain area. However, if the user is walking around, the scanning device may only scan for a few milliseconds per second; or depending on whether the user is home, sitting in a coffee shop, or walking into a meeting room, scanning a few times per minute Hundreds of milliseconds to search for useful information. This background scan can change the behavior of the device depending on the location. For example: automatically mute your cell phone in a coffee shop; transfer incoming calls to your home phone system when you are at home; transfer incoming calls to voicemail when you are in a conference room. And send a text message to the caller, telling him that you are in a meeting and cannot be disturbed. http://www.bjbjaudio.com/      <a style="opacity:0.0;color:#ffffff">tws earbuds wireless</a>

 Universal broadcast
Universal broadcasting is the most versatile broadcasting method. Devices performing general broadcasts can be scanned by scanning devices, or enter a connection as a slave device when a connection request is received. Universal broadcasts can be sent without a connection, in other words, there is no distinction between master and slave devices. http://www.bjbjaudio.com/

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directed broadcast
There are times when a connection between devices needs to be established quickly. If the slave wants to do this, it needs to broadcast. Directed broadcast events are all about establishing connections as quickly as possible. This message contains two addresses: the broadcaster's address and the initiator's address. After receiving the directed broadcast message sent to itself, the initiating device can immediately send a connection request as a response. http://www.bjbjaudio.com/           <a style="opacity:0.0;color:#ffffff">tws earbuds wireless</a>