Empty packets received occasionally on BL653

RE: Empty packets received occasionally on BL653

Håkon Alseth — Tue, 17 Jan 2023 08:40:45 GMT

Hi,

Do you see this issue if you use the stock (unmodified) PRX and PTX samples?

Kind regards,

Håkon

RE: Empty packets received occasionally on BL653

Dagan Raviv — Mon, 16 Jan 2023 15:02:47 GMT

Hi,

I changed the value to 600 on both ends, yet I am still getting empty packets instead of "real" ones once in a while...

Any more ideas?

Kind regards,

Dagan

RE: Empty packets received occasionally on BL653

Håkon Alseth — Thu, 12 Jan 2023 10:17:15 GMT

Hi,

[quote user="Dagan Raviv"] esbConfig.retransmit_delay = 100;[/quote]

This is not a valid range, here's the minimum:

https://github.com/nrfconnect/sdk-nrf/blob/v1.9.1/subsys/esb/esb.c#L35

Can you adjust this delay to 600 and see if the issue still occurs?

Kind regards,

Håkon

RE: Empty packets received occasionally on BL653

Dagan Raviv — Thu, 12 Jan 2023 07:46:41 GMT

Hi,

1. This is my esb configuration:

struct esb_config esbConfig = ESB_DEFAULT_CONFIG;

...

esbConfig.protocol = ESB_PROTOCOL_ESB_DPL;

esbConfig.retransmit_delay = 100;

esbConfig.tx_output_power = ESB_TX_POWER_4DBM;

esbConfig.retransmit_count = 0;

esbConfig.bitrate = ESB_BITRATE_2MBPS_BLE;

esbConfig.event_handler = EventHandler;

esbConfig.mode = ESB_MODE_PTX;

esbConfig.selective_auto_ack = false;

2. I'm using ncs version 1.9.1

3. Unfortunately I don't have a nRF52840-DK, but on a Laird BL653-DK this issue does not occur.

I am using the default base address, but also using address 0xc2c2c2c2 as base_address_1 and assigning 0xe7c2c3c4c5c6c7c8 as prefixes.

Thank you for your assistance,

Dagan

RE: Empty packets received occasionally on BL653

Håkon Alseth — Tue, 10 Jan 2023 08:53:03 GMT

Hi,

Q1: Could you share your esb configuration?

Q2: Which NCS version are you using?

Q3: Is this issue reproducible on a nRF52840-DK?

If you are using the default address (0xe7e7e7e7), there could be other devices in your area that is also using this address space, which will influence your overall communication.

Kind regards,

Håkon

RE: Empty packets received occasionally on BL653

Dagan Raviv — Mon, 09 Jan 2023 14:19:30 GMT

Thanks for your response,

I'm using only one PTX with one PRX device. The packets are being broadcasted over the same RF channel, and the zero sized packets are received every once in a while when a "normal" packet was sent from the PTX.

RE: Empty packets received occasionally on BL653

Håkon Alseth — Mon, 09 Jan 2023 13:48:27 GMT

Hi,

A zero length packet is normally an ACK.

Are you having several PTX communicating towards one PRX? If yes, do the PTX devices have an unique RF address?

Kind regards,

Håkon