nRF9160 mqtt server published message is split in chunks by 120 bytes by UART

RE: nRF9160 mqtt server published message is split in chunks by 120 bytes by UART

Didrik Rokhaug — Fri, 30 Sep 2022 09:03:46 GMT

Add CONFIG_SLM_LOG_LEVEL_DBG=y to your prj.conf, rebuild the program, and re-flash the nRF9160.

Then, with the debugger still connected to the nRF9160, follow this guide to get RTT logs from the nRF9160: https://developer.nordicsemi.com/nRF_Connect_SDK/doc/latest/nrf/gs_testing.html#connecting-using-rtt

RE: nRF9160 mqtt server published message is split in chunks by 120 bytes by UART

Spartak — Thu, 29 Sep 2022 15:15:03 GMT

I show you that host receive only msx 120 bytes of info. Is it somewhere predefined?

Question is simple - which logs you want - from RTT?

RE: nRF9160 mqtt server published message is split in chunks by 120 bytes by UART

Didrik Rokhaug — Thu, 29 Sep 2022 13:22:22 GMT

These are the logs from the host, not the nRF9160.

Can you get me the logs from the Serial LTE Modem application running on the nRF9160?

RE: nRF9160 mqtt server published message is split in chunks by 120 bytes by UART

Spartak — Wed, 28 Sep 2022 19:23:39 GMT

Here is some logs:

ESP:LTE: Bytes received 120
ESP:LTE: Responce: 000000000000000000000000000000000000000000000000000000000000000000000","3C00550000000000000000000000C409C4095C1294110000
ESP:LTE: total_length + xReceivedBytes: 827
ESP:LTE: topic_length + message_length + restBytes 1780
ESP:LTE: Final result not found
ESP:LTE: ok 0
ESP:LTE: Bytes received 120
ESP:LTE: Responce: 00000000000000006400000000000000A00F00000000E02EA406000064000000000020003C003C001E0001006700000000000000000000000100C201
ESP:LTE: total_length + xReceivedBytes: 947
ESP:LTE: topic_length + message_length + restBytes 1780
ESP:LTE: Final result not found
ESP:LTE: ok 0
ESP:LTE: Bytes received 120
ESP:LTE: Responce: 000000000000000000000000000000000000000000000000000000000000000000000000","5F005500C800A00FA00FC8002C01D007D0075C1294115
ESP:LTE: total_length + xReceivedBytes: 1067
ESP:LTE: topic_length + message_length + restBytes 1780
ESP:LTE: Final result not found

RE: nRF9160 mqtt server published message is split in chunks by 120 bytes by UART

Didrik Rokhaug — Wed, 28 Sep 2022 08:45:58 GMT

Like I said in my previous reply, the SLM sends logs over RTT by default, which goes over the debugger interface. Are you able to connect a debugger to the nRF9160, and get the RTT logs?

RE: nRF9160 mqtt server published message is split in chunks by 120 bytes by UART

Spartak — Tue, 27 Sep 2022 12:10:44 GMT

SDK - 2.1.0

It is transmitted in 120 byte chunks on the UART.

I use external MCU to control it so no logs output.

RE: nRF9160 mqtt server published message is split in chunks by 120 bytes by UART

Didrik Rokhaug — Tue, 27 Sep 2022 11:27:43 GMT

Hi,

Which SDK version are you using?

Is the problem that the device is sending 120 byte chunks over the air, or that when you receive a message, it is transmitted in 120 byte chunks on the UART?

Do you have any logs?

(The SLM sends logs over RTT by default. You can enable more logging by setting CONFIG_SLM_LOG_LEVEL_DBG=y in your prj.conf)

Best regards,

Didrik