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 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

[Simon]

Sorry for the delay, I have been quite busy lately. I will look into this the next couple of days.

[Simon]

I opened the sniffer trace and saw a re-transmission rate of only 4% (see image below). Did you interpret the results in the same way? What is the re-transmission rate when the devices are really close, with the same conditions as measured when far apart? Could you ask the customer to measure this?

Best regards,

Simon