configuring device name larger than 31 bytes in nRF52840 (SDK17)

RE: configuring device name larger than 31 bytes in nRF52840 (SDK17)

Simonr — Tue, 15 Jun 2021 11:54:12 GMT

Glad we were able to get to the bottom of this issue!

RE: configuring device name larger than 31 bytes in nRF52840 (SDK17)

Elisa — Mon, 14 Jun 2021 12:31:46 GMT

Thanks Simon,

that was the issue, we made the invocation in the wrong context.

Now it works!

RE: configuring device name larger than 31 bytes in nRF52840 (SDK17)

Simonr — Mon, 31 May 2021 09:26:50 GMT

Which of the functions is it that returns NRF_ERROR_INVALID_STATE though? If it's sd_ble_cfg_set for instance, it means that the BLE stack has already been initialized and that you try doing it again, for instance.

Best regards,

Simon

RE: configuring device name larger than 31 bytes in nRF52840 (SDK17)

Elisa — Thu, 27 May 2021 16:13:17 GMT

Hi Simon,

yes we've already followed the Adjustment of RAM and Flash memory tutorial . Anyway we checked again and verified RAM and FLASH and they are correct. We also tried to decrease the BLE_GAP_DEVNAME_MAX_LEN up to 40 but we get the same error:NRF_ERROR_INVALID_STATE.

We tried also to use BLE_ADVDATA_FULL_NAME instead BLE_ADVDATA_SHORT_NAME in the advertising but with the same result.

Could you have a look at the code I sent in the first message to see if you can see any error?

Could you please send us some more suggestion?

Kind regards

Elisa

RE: configuring device name larger than 31 bytes in nRF52840 (SDK17)

Simonr — Tue, 25 May 2021 07:38:12 GMT

Hi Elisa

I didn't mean to change the BLE_GAP_DEVNAME_DEFAULT_LEN, but to set the limit used by your advertising function to BLE_GAP_DEVNAME_MAX_LEN instead. Indeed, you might need to increase the RAM and Flash memory somewhat. You should get a message by the IDE you're using with a request to increase the RAM to value X. Please follow our Adjustment of RAM and Flash memory tutorial to see how to do so.

Best regards,

Simon

RE: configuring device name larger than 31 bytes in nRF52840 (SDK17)

Elisa — Mon, 24 May 2021 09:25:27 GMT

Hi Simon,

thanks for your prompt reply.

In the advertising we use the shortened name (8bytes) but we need a complete name length up to 40 bytes.
Changing the BLE_GAP_DEVNAME_DEFAULT_LEN we get malfunction because, as explained in the blog, it's the space reserved for the name in the FLASH of SD.
For what we understood in the ticket, to have a complete name higher than BLE_GAP_DEVNAME_DEFAULT_LEN (up to the BLE_GAP_DEVNAME_MAX_LEN value = 248) we need to allocate the device name in the RAM of the application like we did in the code I sent but it doesn't work.

We are using SoftDevice version 7.0.1.

Kind regards

Elisa

RE: configuring device name larger than 31 bytes in nRF52840 (SDK17)

Simonr — Fri, 21 May 2021 12:41:17 GMT

What size are you trying to set the device name to? According to the spec. the maximum device name length is 248. See BLE_GAP_DEVNAME_MAX_LEN in ble_gap.h of the SoftDevice you're using. However, I guess that your advertising_init() function uses the BLE_GAP_DEVNAME_DEFAULT_LEN of 31 as the maximum limit which is why you're seeing this error when trying to increase it beyond 31 bytes.

Best regards,

Simon