multilink centrla,blinky peripheral,one to one, happen re-transmit when distance longee than 80cm

[mahaifeng]

Dear Engineer,

work on sdk15.2, pca10040 eavl board. one as central run this code

 \nRF5_SDK_15.2.0_9412b96\nRF5_SDK_15.2.0_9412b96\examples\ble_central\ble_app_multilink_central\pca10040\s132\arm5_no_packs

Another one as peripheral, run this code

 \nRF5_SDK_15.2.0_9412b96\nRF5_SDK_15.2.0_9412b96\examples\ble_peripheral\ble_app_blinky\pca10040\s132\arm5_no_packs

change connection interval to 10ms.

peripheral send one package to central per 10ms,there no data re-transmit when they are close, less than 80cm.

Once distance longer than 80cm, will happen re-transmit.

The environment is clear, no much interference.

So what will affect ble performance except wifi/2.g interference.

Change tx power to 4dbm ,no help.

Thanks

Best Regards

Robert

[mahaifeng]

Hello,

In central side, once connect one peripheral,will stop scan right away, see below picture.

And do test in a clear environment,no wifi signal, still has retransmit, two board distance less than 1 meter.

Please help check what should do to fix this.

Thanks

Best Regards

Robeet

[mahaifeng]

Hello,

For multilink  project, when it as central.

How config can let it can handle multiple package per conenction,such 6 package per connection.

Thanks

Best Regards

Robert

[Simon]

It sounds strange that packet loss should happen at 80cm. This behavior may happen if you have more BLE activity ongoing (with higher priority), and the data transmission is shifted. Do you have a sniffer trace?

[mahaifeng]

Hello Simon,

Here is sniffer log,

first.cfa

Please help have a check.

Thanks

Best Regards

Robert

[mahaifeng]

Hello Simon,

Customer are pushing us everyday.

Please help check if we can solve re-transmit issue in close distance,less than 1 meter,less wifi signal.

Thank you.

Best Regards

Robert