bluetooth

问题 I wish to keep scanning for Bluetooth Devices and I want app to be alive in the background. Is it possible? It seems like if I have a connected Bluetooth device, and if there is data transfer, then the app stays awake in the background. However, if I am just scanning in the background, it seems like even if I have Uses Bluetooth LE accessories checked( bluetooth-central in plist), the app ends up not running. Is there a way to keep the app alive and continuous scan for devices when it is in

问题 We have a BLE device and android/ios app for communication with the device. The requirement is to have an android/ios app connect to the device without any pairing request. No security is required on the device. Hereafter a few questions around this: Q1. Is it possible at all to have an android/ios app connect to a BLE device without a pairing request? Q2. Does the bonding required for the BLE communication? Q3. What is the downside of having the device with no bonding? Is it going to drop

问题 I want use a bluetooth headset as audio source for recording a video. I can use arecord -D bluetooth -f s16_le -c1 -r8000 command and pipe audio to ffmpeg. But this cause sync problems in audio and video. so i want to capture audio without arecord. How can i define bluetooth device as audio source in ffmpeg command? My asoundrc file: pcm.bluetooth { type bluetooth profile "auto" } ctl.bluetooth { type bluetooth } 回答1: After some digging in the ffmpeg docs, i managed to record sound via

问题 I am runnning an app or service with a active Bluetooth LE scanner and showing scan results on Log console. If I lock the phone in a table and not touching anymore. After a time it stops, and it doesn't give me more scan results. If I press power button and the screen wake up it gives me more scan results. If i lock again the screen or wait to lock automatically it stops and not give me more scan results. I test with service and an app that give me more results by Log and see the app is

问题 I am runnning an app or service with a active Bluetooth LE scanner and showing scan results on Log console. If I lock the phone in a table and not touching anymore. After a time it stops, and it doesn't give me more scan results. If I press power button and the screen wake up it gives me more scan results. If i lock again the screen or wait to lock automatically it stops and not give me more scan results. I test with service and an app that give me more results by Log and see the app is

问题 I am runnning an app or service with a active Bluetooth LE scanner and showing scan results on Log console. If I lock the phone in a table and not touching anymore. After a time it stops, and it doesn't give me more scan results. If I press power button and the screen wake up it gives me more scan results. If i lock again the screen or wait to lock automatically it stops and not give me more scan results. I test with service and an app that give me more results by Log and see the app is

问题 I have working code that sends a struct from a Raspberry Pi to an Arduino using pySerialTransfer when the devices are connected via a USB cable. I'd like to do that over bluetooth instead of with a USB cable, however. Independently, using separate python code and a separate Arduino sketch, I've been able to get the Raspberry Pi & Arduino to communicate over bluetooth via a continuous stream of text or binary data. My issue is that I don't see how to combine the two approaches - i.e.: if I

问题 It is possible to change the Bluetooth device name using BluetoothAdapter.getDefaultAdapter().setName() in Android, but I am unable to find how we can do it in Flutter. I've tried using the flutter_blue package; however, I don't see how we can achieve it. Thanks in advance! 回答1: // BT Rename // final String sNewName = "Syntactics"; final BluetoothAdapter myBTAdapter = BluetoothAdapter.getDefaultAdapter(); final long lTimeToGiveUp_ms = System.currentTimeMillis() + 10000; if (myBTAdapter !=

问题 I would like to know how to realize a sort of "bluetooth broadcast" (using Bluetooth Low Energy) for a Flutter application. In particular, i want to achieve those points: I want to send random string and integers "in the air" using bluetooth. I want also to be able to receive those data by other devices The app must be able to send and receive simultaneously Now, i checked some beacon library from pub.dev (like this or this) but it turns out that probably i did not understand if and how those

问题 I would like to know how to realize a sort of "bluetooth broadcast" (using Bluetooth Low Energy) for a Flutter application. In particular, i want to achieve those points: I want to send random string and integers "in the air" using bluetooth. I want also to be able to receive those data by other devices The app must be able to send and receive simultaneously Now, i checked some beacon library from pub.dev (like this or this) but it turns out that probably i did not understand if and how those