Comments (3)
softcharles
commented on August 22, 2024
1
The dfu library uses BluetoothDevice.connectGatt to connect to the device. I Think that will only work (since the device is not bonded) if the device has a public Bluetooth address or the device has been scanned at least once before connection attempt since bluetooth adapter have been started.
Read the chapter 3 in the BLE_on_Android_v1.0.1.pdf on this page https://devzone.nordicsemi.com/blogs/1046/what-to-keep-in-mind-when-developing-your-ble-andr/
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troyjperales
commented on August 22, 2024
@softcharles Thanks for sharing the document. It helped tremendously!
I was able to connect to the device after scanning with a filter that included it's address. I believe a lot of 133 errors could be prevented if the scanning for the given device address was included in the library prior to connecting.
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philips77
commented on August 22, 2024
Hi, you can start the DFU while being connected in your app, so initial scanning in the app is not possible as it may not advertise at the moment. I think DFUing a device that has never been even scanned is not a common thing... Glad that the document has helped.
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