I think the key thing missing here is that you did not press the Encrypt button. This can be verified from the log. BLE GUI does not automatically turn on encryption, it needs to be done explicitly with the Encrypt button after you have opened the connection.

When you test with your laptop the computer most probably turns on encryption under the hood and possibly also creates a bonding with the other device.

You need to configure the security manager settings before opening the connection. I suggest that you try with something like:

• NoInputNoOutput
• Man in the middle NOT checked
• bondable checkbox checked

Then press Set Parameters. This writes the selected settings to the dongle. (It's a volatile setting, i..e they will be restored to defaults if you reset or unplug the dongle)

After setting the parameters, you connect to the target device. After connection is established, press the Encrypt button next to the GATT button. This should request encryption of the link and it is done based on the settings that you specified earlier. With the settings mentioned above, the bonding should be created without any user input. (It is possible that the target device does not support this combination, but worth trying anyway).

If the encryption is successful then try reading the characteristics in the GATT. If it still does not work, copy the log file here.

If the bonding is not successful with above settings, I would next try:

• DisplayYesNo
• Man in the middle = checked
• bondable = checked

In this case, when you click the Encrypt button after connecting you should see a pop-up window Yes/No appearing, asking you to confirm the bonding.

The log at the bottom of the screenshot shows in red font:

result:0x0405 "the attribute requires authentication before it can be read or written"

Like Wojciech pointed out, it's related to security manager settings. See also: BLE GUI user guide => https://www.silabs.com/documents/public/user-guides/UG208.pdf

And section 4.3.2 Security Manager

BLE update tool is bundled into the Bluegiga BLE SDK and you can download it here: (check software & tools section)

https://www.silabs.com/wireless/bluetooth/bluegiga-low-energy-legacy-modules/device.ble112

After installing, you can find the bleupdate.exe in C:\Bluegiga\BleUpdate\

BLE update tool is bundled into the Bluegiga BLE SDK and you can download it here:

https://www.silabs.com/wireless/bluetooth/bluegiga-low-energy-legacy-modules/device.ble112

After installing, you can find the bleupdate.exe in C:\Bluegiga\BleUpdate\

You are not going to get any useful answers in this forum. The discussion is limited to Silicon labs products and silabs implementation of the BLE stack.

Try asking in for example stackoverflow or reddit (/r/embedded or other suitable subdreddit). If you decide to post there, add a link here because I'm interested to follow up.

You are not going to get any useful answers in this forum. The discussion is limited to Silicon labs products and silabs implementation of the BLE stack.

Try asking in for example stack overflow or reddit (/r/embedded or other suitable subdreddit). If you decide to post there, add a link here because I'm interested to follow up.