Hello,
in my Scatternet, I often receive HCI Connection Timeouts. Depending on the settings this happens once or twice over half a day between 10 Nodes or it could happen multiple times. The Scatternet does not have circles but is built as a tree. The RSSI between nodes was not worse than -80. I do send some packets between devices from time to time.
Here's my Setup:
All Devices are connected to one, two or three other devices. Slave and Central at the same time:
- 10 nRF51 Dongles with S130 v2.0.0-8 alpha
- Connection interval 10ms
- Supervision timeout: 6000 ms
Meanwhile, they scan with the following settings:
- Scan Interval: 20ms
- Scan Window: 4ms
And they advertise:
- Advertising Interval 100 ms
I initialize the Softdevice with NRF_CLOCK_LF_XTAL_ACCURACY_500_PPM, which is the most forgiving value that I could possibly pick. I tried with other values but the connection seemed to be less stable.
Now here are my questions:
Is there anything I could be doing wrong in my program code? I do not block interrupts or anything so I would guess that there's nothing that I could be doing wrong which would cause HCI Connection Timeouts. Because I thought that Connections are fully handled by the SoftDevice.
With the given parameters I would not expect connection losses to happen this often. Can you confirm this with internal measurements that this is really to be expected?
Marius