Bluetooth devices won’t connect
I am having problems connecting devices to Bluetooth using Windows 10.
The motherboard is a ASUS Z270E with built in Bluetooth which is turned on in the BIOS and Windows has all the latest updates.
The Bluetooth detects ALL devices I have tried:
— Bluetooth Soundbar
— Samsung Galaxy S5 & TAB S2
— Microsoft Wireless Controller
But when I click connect it says connecting for around 1 minute before giving the message — «Couldn’t connect. Try connecting again.»
I have tried all the Windows 10 Bluetooth fixes when searching Google. e.g. Turning Bluetooth and devices on and off, Uninstalling drivers and reinstalling etc .
I originally thought it was a motherboard problem. So contacted ASUS where they said to update the drivers to the latest . which I did but still the same problem.
So I found an old Bluetooth dongle I had with my old PC and installed that but still the same problem. Finally bought a brand new dongle and that arrived the other day. Installed that but the problem still persists.
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Saltgrass
Different devices behave different ways with Bluetooth. Sometimes different processes are required to get a device connected. Since you have tried external Bluetooth dongles, it would point to your devices having a problem.
Edit: That motherboard probably has an external antenna for Wi-Fi and Bluetooth, it is connected and line of sight to the devices?
On my system, once a device is already paired with the computer, all I have to do is enable its power. On some devices that means flipping a switch but on others it means holding the button for a few seconds until you hear tones. Once that is done, the computer should connect automatically.
So, look at the Settings — Devices — Bluetooth page. Does the Bluetooth show ON and your device is listed and shows paired when selected? If it does, what happens when you enable the power on the device, the can’t connect message?
If it doesn’t connect, then the first thing to try is to remove the device. Then repair it and see if it will connect. You now probably have a Bluetooth 4.1 or 4.2 radio. If you are running devices which are 3.0 or such it may take a different procedure to get the to connect, which means repairing and connecting at the same time.
A few years ago I rarely used any Bluetooth devices because they were not reliable and I had problems similar to what you are seeing. The newer systems seem to be much more stable and will connect, normally, with just the push and hold of a button.
heartsfan
Different devices behave different ways with Bluetooth. Sometimes different processes are required to get a device connected. Since you have tried external Bluetooth dongles, it would point to your devices having a problem.
Edit: That motherboard probably has an external antenna for Wi-Fi and Bluetooth, it is connected and line of sight to the devices?
On my system, once a device is already paired with the computer, all I have to do is enable its power. On some devices that means flipping a switch but on others it means holding the button for a few seconds until you hear tones. Once that is done, the computer should connect automatically.
So, look at the Settings — Devices — Bluetooth page. Does the Bluetooth show ON and your device is listed and shows paired when selected? If it does, what happens when you enable the power on the device, the can’t connect message?
If it doesn’t connect, then the first thing to try is to remove the device. Then repair it and see if it will connect. You now probably have a Bluetooth 4.1 or 4.2 radio. If you are running devices which are 3.0 or such it may take a different procedure to get the to connect, which means repairing and connecting at the same time.
A few years ago I rarely used any Bluetooth devices because they were not reliable and I had problems similar to what you are seeing. The newer systems seem to be much more stable and will connect, normally, with just the push and hold of a button.
It’s definetly not the devices . as they can all connect to each other.
Yes the onboard Bluetooth has an Antenna which is connected . which is why it detects all the devices but they just won’t connect.
All troubleshooting I have done all points to Windows 10 being the problem. But nothing I have searched for and tried has managed to fix the problem.
How many devices we can pair via Bluetooth of BLE to Android?
A search of the Android Bluetooth Firmware source shows the following:
Max concurrent active synchronous connections ( BTA_GATTC_CONN_MAX ):
Max concurrent active notifications ( BTA_GATTC_NOTIF_REG_MAX ):
As a comparison my experience with iOS is that 8 devices can be connected at at time.
I tried connecting more than 7 devices the other day on Android 7.1 and Bluetooth stopped responding. Starting and stopping didn’t help; the only thing that fixed it was restarting the device.
After working with several apps that connect to 4+ devices I can say from experience that these numbers are theoretical. Depending on each individual device and its hardware you’ll have an easier or harder time connecting to and maintaining a connection to the maximum number of BLE devices.
A master Bluetooth device can communicate with a maximum of seven devices in a piconet (an ad-hoc computer network using Bluetooth technology), though not all devices reach this maximum.
You need know Master/Slave in Bluetooth first.
I think the good answer depend on your aim.
You’re right when you know «can communicate with how many devices» depend on Hardware (Bluetooth Chip) . Bluetooth chip on Apple iPhone 4, 5 or Samsung Galaxy S3, S4 . totally different with Basic Bluetooth Chip .
I’m working with Firmware side related to BLE.
His peripheral device has used Basic Bluetooth Chip since it did not has enough memory to store many capacities as many features, likes Bluetooth chip on Apple iPhone 4, 5 or Samsung Galaxy S3, S4 .
Therefore, his peripheral device only paired with one device in one time .
Can someone else confirm this? This would be a limitation imposed via the Android OS as the hardware should be able to handle more.
I’m more confused now. BLE doesn’t have any concept of piconets, only regular Bluetooth does. I’ve connected 7 sensors with one bluetooth dongle via BLE all at once, so I know that BLE is capable of more than 1 device at a time. So, any limitation would be in the OS and you haven’t referenced anything saying that Android is limited to one device. Also, reTs has connected 4 devices with an Android device, so I’m thinking that it’s possible to connect to more than one.
@Tim Tisdall : hello Tim, u already check this case? How many devices u can connect in the same time?
Both of the answers here are wanting so I thought I should add one:
There are connection limitations built in to the different BLE hardware. I think the lowest I’ve encountered is 3 connections at once and the highest was about 12-13 connections. These were limitations due to the design of the hardware and had nothing to do with the OS being used, though. Usually the limitation is due to the fact that the hardware has to keep track of certain data and there’s a limited amount of memory in the hardware.
So, I don’t know specifically for Android, but it doesn’t make much sense for a limitation to be imposed at the OS level. Likely when you try to make a connection, and you’ve reached the limit due to the hardware, you should receive some sort of error/exception preventing the new connection. I think there’s actually a «connection limit» error in Bluetooth, but some hardware gives other exceptions like «out of resources». Again, I’m not sure how that gets reflected on the Android level.