How to reduce pakets loss on BLE Mesh

RE: How to reduce pakets loss on BLE Mesh

Nguyễn — Wed, 11 Sep 2019 07:39:46 GMT

I modify the light_switch_example, then add simple_message_model to transmit character array.

For test success rate, I modify ble_beacon_example with the minor value increase + 1 each advertisioning. In the AP code, I will check current minor value and previous value. If current minor value = previous minor value + 1 => success, if current minor value > previous minor value + 1 => loss some packet

I haven't try use reliable communication.

RE: How to reduce pakets loss on BLE Mesh

Joakim Jakobsen — Wed, 11 Sep 2019 06:26:44 GMT

Thanks!

How to you verify that the messages is in fact sent from the beacon/AP?

Could you test using one of the BLE examples if you get the same bad performance?

[quote user="Joakim-Jakobsen"]If you want to have more reliable communication you could try to use set with acknowledge message so that when there is a timeout the stack will re-transmit the data.
[/quote]

Have you tried this?

Regards,
Joakim

RE: How to reduce pakets loss on BLE Mesh

Nguyễn — Tue, 10 Sep 2019 08:49:04 GMT

Result for test 1GW, 4 AP, 6 beacons

RE: How to reduce pakets loss on BLE Mesh

Nguyễn — Tue, 10 Sep 2019 08:43:36 GMT

Thank you for your reply.

I use nRF52840 dongle for all Gateway, APs and Beacons

In the case test with 1 GW, 1 AP and 9 beacons., I have log from GW and 1 AP. And I see that: The AP receive success ~60% packets, and GW receive success ~40%

RE: How to reduce pakets loss on BLE Mesh

Joakim Jakobsen — Tue, 10 Sep 2019 08:28:54 GMT

Hi.

Some packet loss is to be expected, due to RF interference or similar. Increasing the advertising interval, increasing the number of nodes etc. will also increase the packet loss. However, the packet loss you are seeing is quite high!
You could try testing in an environment with less air traffic (WiFi for example).

You say that the gateway is receiving ~40% with 9 beacons and 1 AP. Have you done any tests to figure out if the packet loss is between the Beacon - AP or between AP - Gateway?

You are using the nRF52940 Dongle as the beacons. Which HW are you using for the AP and the gateway?

If you want to have more reliable communication you could try to use set with acknowledge message so that when there is a timeout the stack will re-transmit the data.

Regards,
Joakim