bluetooth-lowenergy

问题 My app using Altbeacon library for beacon scanning. my code working well to api level 24(android 7) but doesn't not working on oreo(8.0.0) at first, my gradle setting compileSdkVersion and targetSdkVersion is 26, i thought it was because of this. so, i reference this**https://developer.android.com/about/versions/oreo/background.html#services**, fix my gradle setting(compileSdkVersion 25, targetSdkVersion 25). and install this app on device (apilevel 24, 26) on 24 level device working well,

问题 My app using Altbeacon library for beacon scanning. my code working well to api level 24(android 7) but doesn't not working on oreo(8.0.0) at first, my gradle setting compileSdkVersion and targetSdkVersion is 26, i thought it was because of this. so, i reference this**https://developer.android.com/about/versions/oreo/background.html#services**, fix my gradle setting(compileSdkVersion 25, targetSdkVersion 25). and install this app on device (apilevel 24, 26) on 24 level device working well,

问题 When I try to read a BLE characteristic which require encryption via GattTool on a RPI 3B gatttool -b 04:EE:03:B1:47:DF --char-read --handle=0x000e --sec-level=low It end up with an error Characteristic value/descriptor read failed: Request attribute has encountered an unlikely error I tried with/without --sec-level=low|medium|high hcidump 2020-06-05 10:35:50.696249 < HCI Command: LE Set Scan Parameters (0x08|0x000b) plen 7 type 0x00 (passive) interval 60.000ms window 30.000ms own address:

问题 I want to capture/dump BLE air interface Link Layer packets in linux stably. The BLE air interface Link Layer packets seem like follows: sniffered using ubertooth when connecting another BLE device However, sniffering through ubertooth is much less reliable(often lose packets). So, I want to dump BLE traffic data using tools like tcpdump and btmon. I got results like this: result of tcpdump when connecting another BLE device However, there is no information about LL_ENC_REQ and LL_ENC_RSP,

问题 Hello I am wondering what write and notify characteristic I should use from this OBDII BLE device/Dongle?: I want to create a program for IOS in Flutter. There are quite a few : Device name: VEEPEAK Device id: 34E2B2AF-60F4-9362-DBF6-AD750321AABA Number of discovered Services: 3 Service Service: UUID: 0000180a-0000-1000-8000-00805f9b34fb Charac.: UUID: 00002a29-0000-1000-8000-00805f9b34fb Can read: true Can write: false Can notify: false Charac.: UUID: 00002a24-0000-1000-8000-00805f9b34fb Can

问题 I'm trying to write in a characteristic that sends a binary file as the value, this value is large, it's 19215 bytes which is not a problem because i negociated the mtu using : device.connect({ requestMTU: 260 }) i've divided the file into 240 bytes for each element and each time encode the element to base64 and i use the function writeCharacteristicWithResponseForDevice() in order to write that element, the issue is i successfully wrote the whole file 19215 bytes using a loop to write each

问题 I'm trying to create an iOS app that will read from an OBDII Bluetooth 4 (LE) device. I purchased a Vgate icar3 bluetooth(4.0) elm327 OBDII. I plug it into my car and find IOS-VLink peripheral that advertises some services. I can then get the characteristics for those services. These are the services I find: <CBService: 0x1780729c0, isPrimary = YES, UUID = Battery> <CBService: 0x178072a80, isPrimary = YES, UUID = 1803> <CBService: 0x178072ac0, isPrimary = YES, UUID = 1802> <CBService:

问题 I'm trying to create an iOS app that will read from an OBDII Bluetooth 4 (LE) device. I purchased a Vgate icar3 bluetooth(4.0) elm327 OBDII. I plug it into my car and find IOS-VLink peripheral that advertises some services. I can then get the characteristics for those services. These are the services I find: <CBService: 0x1780729c0, isPrimary = YES, UUID = Battery> <CBService: 0x178072a80, isPrimary = YES, UUID = 1803> <CBService: 0x178072ac0, isPrimary = YES, UUID = 1802> <CBService:

问题 I'm trying to create an iOS app that will read from an OBDII Bluetooth 4 (LE) device. I purchased a Vgate icar3 bluetooth(4.0) elm327 OBDII. I plug it into my car and find IOS-VLink peripheral that advertises some services. I can then get the characteristics for those services. These are the services I find: <CBService: 0x1780729c0, isPrimary = YES, UUID = Battery> <CBService: 0x178072a80, isPrimary = YES, UUID = 1803> <CBService: 0x178072ac0, isPrimary = YES, UUID = 1802> <CBService:

问题 When an iOS BLE peripheral enters the background state, the advertising packets are not emitted in the regular manner and they are placed in a special “overflow” area which is only detectable by another iOS device explicitly looking for this device. The bluetooth-peripheral Background Execution Mode That said, you should be aware that advertising while your app is in the background operates differently than when your app is in the foreground. In particular, when your app is advertising while