Epollrdhup android central
29.06.2020 | by Vuran
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More news. Latest videos. More videos.Android 4. This allows Android apps to communicate with BLE devices that have stricter power requirements, such as proximity sensors, heart rate monitors, and fitness devices.
Caution: When a user pairs their device with another device using BLE, the data that's communicated between the two devices is accessible to all apps on the user's device. For this reason, if your app captures sensitive data, you should implement app-layer security to protect the privacy of that data. Here are the roles and responsibilities that apply when an Android device interacts with a BLE device:.
To understand the distinction, imagine that you have an Android phone and an activity tracker that is a BLE device. The phone supports the central role; the activity tracker supports the peripheral role to establish a BLE connection you need one of each—two things that only support peripheral couldn't talk to each other, nor could two things that only support central. Once the phone and the activity tracker have established a connection, they start transferring GATT metadata to one another.
Depending on the kind of data they transfer, one or the other might act as the server. For example, if the activity tracker wants to report sensor data to the phone, it might make sense for the activity tracker to act as the server. If the activity tracker wants to receive updates from the phone, then it might make sense for the phone to act as the server.
See BluetoothGattServer for more information. You need this permission to perform any Bluetooth communication, such as requesting a connection, accepting a connection, and transferring data.
Because discoverable devices might reveal information about the user's location, the device discovery process requires location access.
If your app is being used on a device that runs Android 8. This API performs device discovery on your app's behalf, so your app doesn't need to request location permissions. If you want to declare that your app is available to BLE-capable devices only, include the following in your app's manifest:.
Before your application can communicate over BLE, you need to verify that BLE is supported on the device, and if so, ensure that it is enabled. If BLE is supported, but disabled, then you can request that the user enable Bluetooth without leaving your application.
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This setup is accomplished in two steps, using the BluetoothAdapter. The BluetoothAdapter is required for any and all Bluetooth activity.
The BluetoothAdapter represents the device's own Bluetooth adapter the Bluetooth radio. There's one Bluetooth adapter for the entire system, and your application can interact with it using this object. The snippet below shows how to get the adapter. Note that this approach uses getSystemService to return an instance of BluetoothManagerwhich is then used to get the adapter.
Next, you need to ensure that Bluetooth is enabled. Call isEnabled to check whether Bluetooth is currently enabled. If this method returns false, then Bluetooth is disabled. The following snippet checks whether Bluetooth is enabled.
If it isn't, the snippet displays an error prompting the user to go to Settings to enable Bluetooth:. Intent, int is a locally-defined integer which must be greater than 0 that the system passes back to you in your onActivityResult int, int, android. Intent implementation as the requestCode parameter.
Stack Overflow for Teams is a private, secure spot for you and your coworkers to find and share information. Also see this questionunanswered as of now. People seem to believe it is returned when polling on a descriptor locally closed for writingi. This other article just confuses things further and seems outright wrong to me.
Also nothing to do with close. If confirmed, this is great, because it fills a gap that I've been looking for, namely how to poll non-blocking sockets for the final ack, without LINGER. Is this correct? The code being in a framework, I extracted the meat of it, with the exception of TcpSocket::createListenerTcpSocket::connect and TcpSocket::acceptwhich do what you'd expect not shown here. I made the case that documentation is poor, and information in other places e.
For these kind of questions, use the source! Among other interesting comments, there is this text:. TL; DR; You are right, this flag is only sent when the shutdown has been both for read and write I reckon that the peer shutdowning the write equals to my shutdowning the read.
Or when the connection is closed, of course. It is actually expected if you understand the output of epoll not as ready but as will not block.
Learn more. Ask Question. Asked 1 year, 8 months ago. Active 1 year, 8 months ago. Viewed 2k times. Active Oldest Votes. In any case your reading half-socket is hung, that is, you will read no more data. Now you can close the socket with grace. PS : About your comment: it's counterintuitive to get writable, as the writing half is closed It is actually expected if you understand the output of epoll not as ready but as will not block.
I reckon that the peer shutdowning the write equals to my shutdowning the read No, you see, that is confusing.Google serves cookies to analyze traffic to this site. Information about your use of our site is shared with Google for that purpose. See details. Easier ways to organize conversations and manage smart home devices. New ways to control if and when apps access your data—and so much more.
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epoll_ctl(2) - Linux man page
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Bluetooth low energy overview
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