ncs 1.6.1 peripheral_uart difference between nRFConnect for Mobile and nRFToolBox UART

RE: ncs 1.6.1 peripheral_uart difference between nRFConnect for Mobile and nRFToolBox UART

Susheel Nuguru — Thu, 11 Nov 2021 11:54:47 GMT

Great,

The IOS version I have does not seem to support this.functionality.

RE: ncs 1.6.1 peripheral_uart difference between nRFConnect for Mobile and nRFToolBox UART

RHeine — Tue, 09 Nov 2021 15:52:22 GMT

Hi Susheel,

I find this post:

https://devzone.nordicsemi.com/f/nordic-q-a/74604/in-connect-sdk-v1-5-0-nrf-samples-bluetooth-peripheral_uart-data-number-is-limited-20-bytes-more-than-20bytes-ble-will-part-data-in-two-or-more-packs-to-send-or-receive/309239#309239

That explain how to modify MTU size on the app nRFConnect, on the top right the there is 3 dots ranged verticaly, there I can modify "request MTU". I put 239 and I no more error, I can send enougth bytes with nRFConnect now !

RE: ncs 1.6.1 peripheral_uart difference between nRFConnect for Mobile and nRFToolBox UART

RHeine — Tue, 09 Nov 2021 14:13:33 GMT

Additionnal information:

I resolved the log inf: <log_strdup alloc failed>, by insering in prj.conf file:

CONFIG_LOG_STRDUP_MAX_STRING=251
CONFIG_LOG_STRDUP_BUF_COUNT=15

but I still have the problem with:

[00:00:41.223,632] <wrn> bt_att: No ATT channel for MTU 30
[00:00:41.223,632] <wrn> bt_gatt: No buffer available to send notification
[00:00:41.223,632] <wrn> peripheral_uart_256a: Failed to send data over BLE connection

I cannot send from the computer to the smartphone more then 19 bytes with nRFConnect.

RE: ncs 1.6.1 peripheral_uart difference between nRFConnect for Mobile and nRFToolBox UART

RHeine — Tue, 09 Nov 2021 10:53:18 GMT

Hi Susheel,

Thank you for your help.

I managed to get the sniffer to work.

There is the communication and the log with nRF ToolBox UART:

devzone.nordicsemi.com/.../nrfToolBox_5F00_UART_5F00_peripheral_5F00_uart_5F00_256a.pcapng devzone.nordicsemi.com/.../nrfToolBox_5F00_UART_5F00_peripheral_5F00_uart_5F00_256a.txt

I can see on line 1285 a sent write request where I send a packet 246 bytes (reassambled) and on line 4313 I received handle value notification a packet of 247 bytes (reassambled).

There is the communication and the log with nRFConnect:

devzone.nordicsemi.com/.../nrfConnect_5F00_peripheral_5F00_uart_5F00_256a.pcapng devzone.nordicsemi.com/.../nrfConnect_5F00_peripheral_5F00_uart_5F00_256a.txt

I can see on line 9365 I received handle value notification a packet of 18 bytes.

I cannot see the packet with more then 20 bytes send, where you have the warning "bt_att: No ATT channel for MTU 30 / bt_gatt: No buffer available to send notification / peripheral_uart_256a: Failed to send data over BLE connection" on the log message.

I can see on line 10799 a sent write request where I send a packet of 18 bytes,

line 10805 18 bytes more, line 10811 18bytes more, line 10817 18 bytes more..

For a total 12 packet of 18 bytes where send (216 bytes).

There is my project:

devzone.nordicsemi.com/.../3162.prj.conf devzone.nordicsemi.com/.../4743.nrf5340dk_5F00_nrf5340_5F00_cpuapp.overlay devzone.nordicsemi.com/.../6862.CMakeLists.txt devzone.nordicsemi.com/.../4452.Kconfig.txt

devzone.nordicsemi.com/.../4857.main.c

Best Regards,

Rob.

RE: ncs 1.6.1 peripheral_uart difference between nRFConnect for Mobile and nRFToolBox UART

Susheel Nuguru — Mon, 08 Nov 2021 15:40:43 GMT

Not sure what is happening on the receiver end. A sniffer log would help a lot to understand the issue looking at the communication in detail. The logs are not very informative. Please share your modifications so that i can reproduce this or add detail sniffer logs for this communication.

RE: ncs 1.6.1 peripheral_uart difference between nRFConnect for Mobile and nRFToolBox UART

RHeine — Mon, 08 Nov 2021 12:37:12 GMT

Additionnal information:

With "CONFIG_BT_ATT_PREPARE_COUNT=6" I 'm limited to 108 bytes on Rx characteristic.

I put "CONFIG_BT_ATT_PREPARE_COUNT=15" then I can send more then 239 bytes on Rx characteristic, but I have a log inf:

<log_strdup alloc failed>

What does it mean ?

Best Regards,

Rob.

RE: ncs 1.6.1 peripheral_uart difference between nRFConnect for Mobile and nRFToolBox UART

RHeine — Mon, 08 Nov 2021 11:15:19 GMT

Hi Susheel,

Thank you for your answer.

I put "CONFIG_BT_ATT_PREPARE_COUNT=6", now I can send more data on RX charateristic with nRFConnect,

I will have a look of the limit.

But on Tx characteristic I can't send more then 19 bytes I still have the same problem.

I have a problem with python on my computer, I not able to make the sniffer work on it.

Best Regards,

Rob.

RE: ncs 1.6.1 peripheral_uart difference between nRFConnect for Mobile and nRFToolBox UART

Susheel Nuguru — Mon, 08 Nov 2021 10:40:57 GMT

It seems like more prepare writes are being performed than the config (CONFIG_BT_ATT_PREPARE_COUNT=2) set. Try to increase this size. It would be really good get a sniffer trance of the whole transaction in the not working setup (mobile) to get an even deeper understanding of the communication between your device and the mobile app.