Try this… Run gatttool -b <MAC Address> –interactive like you did before. You’ll get a prompt and then you type connect. You should see a CON in the prompt indicating that you’ve connected to the device. Then type char-read-uuid 2902. You should get a list of all CCC (Client Characteristic Configuration) attributes on the device. … Read more
Alright I have figured it out. The issue was mainly an oversight of when I was reading through the BluetoothGatt documentation. I was calling .disconnect(), but not .close(). Since the Galaxy s4 can only handle 6 connections at a time, my service was only running 6 times. Adding the .close() to my code allowed it … Read more
I’ve already gone through this for at least one week having this same issue. I’ve already asked a question here and I’ve already answered on my own. The main problem is an Android BUG issue. It’s sending a non permitted command on a fixed L2CAP channnel. But when Android is communicating with normal peripheral BLE … Read more
Using the class UUID An example like this: UUID.randomUUID().toString()
I struggled with the same issue. To fix it you have to enable “Location” (GPS) in the settings of the phone as well as request location permission in the app at runtime. Both need to be done for scanning to work properly. To request the location permission put the following in a dialog or the … Read more
This functionality has all been moved to the open source Android Beacon Library which will: wake up/launch your app when iBeacons matching a desired pattern are detected perform beacon scanning in the background even if the user has not launched your app yet reduce the scan rate automatically in the background to 30 seconds every … Read more
You have to wait until the [-CBCentralManagerDelegate centralManagerDidUpdateState:] callback has been called. And then, verify that the state is PoweredOn before you start scanning for peripherals.
I finally figured this problem out. The device I am using is a Samsung Galaxy S4 and the actual problem (thanks Wibble for guidance in your answer, but you are slightly off in your conclusion) appears to be a threading issue. In Wibble’s answer, he stated that adding a button to connect fixed his issue. … Read more
That happens often really often to me. I’m developing with it and it just happens from time to time. I was also able to reproduce your error within 5 minutes 😉 I’m running bluez v.5.17. However i can run lescan more than one time without this error. hcitool lescan Set scan parameters failed: Input/output error … Read more
With your Bluetooth dongle plugged in, running the following command will tell you the device name and give its state: $ hciconfig The output should look something like this: hci0: Type: BR/EDR Bus: USB BD Address: 00:01:02:aa:bb:cc ACL MTU: 1021:8 SCO MTU: 64:1 DOWN RX bytes:1000 acl:0 sco:0 events:47 errors:0 TX bytes:1072 acl:0 sco:0 commands:47 … Read more