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Nordic Case Info
  • Case ID: 310887
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MQTT publish POLLERR error

yesheng

Hi,

I'm using nrf9160 MQTT at commands to send real-time data to the cloud. I run into the issue where the MQTT publish may fail (frequency varies around 1 out of 500 publishes). One thread suggests the MQTT fails if the message is too long, however, I don't think this is my case. Any suggestions on how to debug this issue?

Thanks!

Ye-Sheng

The debug message from the modem

This is the working one:

00> [00:18:17.373,504] <inf> slm_at_host: Enter datamode
00> [00:18:17.550,323] <inf> slm_at_host: time limit reached
00> [00:18:17.550,384] <inf> slm_at_host: Raw send 1479
00> [00:18:17.550,415] <dbg> net_mqtt: mqtt_publish: (0x2001b2b8): [CID 0x2001b5cc]:[State 0x06]: >> Topic size 0x00000015, Data size 0x000005c7
00> [00:18:17.550,476] <dbg> net_mqtt_enc: pack_utf8_str: (0x2001b2b8): >> str_size:00000017 cur:0x2001f163, end:0x2001f35e
00> [00:18:17.550,506] <dbg> net_mqtt_enc: pack_uint16: (0x2001b2b8): >> val:0015 cur:0x2001f163, end:0x2001f35e
00> [00:18:17.550,506] <dbg> net_mqtt_enc: mqtt_encode_fixed_header: (0x2001b2b8): << msg type:0x30 length:0x000005de
00> [00:18:17.550,537] <dbg> net_mqtt_enc: packet_length_encode: (0x2001b2b8): >> length:0x000005de cur:(nil), end:(nil)
00> [00:18:17.550,537] <dbg> net_mqtt_enc: mqtt_encode_fixed_header: (0x2001b2b8): Fixed header length = 03
00> [00:18:17.550,537] <dbg> net_mqtt_enc: pack_uint8: (0x2001b2b8): >> val:30 cur:0x2001f160, end:0x2001f35e
00> [00:18:17.550,567] <dbg> net_mqtt_enc: packet_length_encode: (0x2001b2b8): >> length:0x000005de cur:0x2001f161, end:0x2001f35e
00> [00:18:17.550,567] <dbg> net_mqtt: client_write_msg: (0x2001b2b8): [0x2001b5cc]: Transport writing message.
00> [00:18:17.554,443] <dbg> net_mqtt: client_write_msg: (0x2001b2b8): [0x2001b5cc]: Transport write complete.
00> [00:18:17.554,473] <dbg> net_mqtt: mqtt_publish: (0x2001b2b8): [CID 0x2001b5cc]:[State 0x06]: << result 0x00000000
00> [00:18:17.554,504] <inf> slm_mqtt: datamode send: 0
00> [00:18:18.542,633] <inf> slm_at_host: time limit reached
00> [00:18:18.542,724] <inf> slm_at_host: Raw send 1478
00> [00:18:18.542,724] <dbg> net_mqtt: mqtt_publish: (0x2001b2b8): [CID 0x2001b5cc]:[State 0x06]: >> Topic size 0x00000015, Data size 0x000005c6
00> [00:18:18.542,785] <dbg> net_mqtt_enc: pack_utf8_str: (0x2001b2b8): >> str_size:00000017 cur:0x2001f163, end:0x2001f35e
00> [00:18:18.542,816] <dbg> net_mqtt_enc: pack_uint16: (0x2001b2b8): >> val:0015 cur:0x2001f163, end:0x2001f35e
00> [00:18:18.542,816] <dbg> net_mqtt_enc: mqtt_encode_fixed_header: (0x2001b2b8): << msg type:0x30 length:0x000005dd
00> [00:18:18.542,846] <dbg> net_mqtt_enc: packet_length_encode: (0x2001b2b8): >> length:0x000005dd cur:(nil), end:(nil)
00> [00:18:18.542,846] <dbg> net_mqtt_enc: mqtt_encode_fixed_header: (0x2001b2b8): Fixed header length = 03
00> [00:18:18.542,846] <dbg> net_mqtt_enc: pack_uint8: (0x2001b2b8): >> val:30 cur:0x2001f160, end:0x2001f35e
00> [00:18:18.542,877] <dbg> net_mqtt_enc: packet_length_encode: (0x2001b2b8): >> length:0x000005dd cur:0x2001f161, end:0x2001f35e
00> [00:18:18.542,877] <dbg> net_mqtt: client_write_msg: (0x2001b2b8): [0x2001b5cc]: Transport writing message.
00> [00:18:18.546,844] <dbg> net_mqtt: client_write_msg: (0x2001b2b8): [0x2001b5cc]: Transport write complete.
00> [00:18:18.546,875] <dbg> net_mqtt: mqtt_publish: (0x2001b2b8): [CID 0x2001b5cc]:[State 0x06]: << result 0x00000000
00> [00:18:18.546,875] <inf> slm_mqtt: datamode send: 0
00> [00:18:18.546,905] <inf> slm_at_host: datamode off pending
00> [00:18:18.557,098] <inf> slm_at_host: Exit datamode

This is the failed one.
00> [00:18:19.397,705] <inf> slm_at_host: Enter datamode
00> [00:18:19.573,089] <inf> slm_at_host: time limit reached
00> [00:18:19.573,150] <inf> slm_at_host: Raw send 1466
00> [00:18:19.573,150] <dbg> net_mqtt: mqtt_publish: (0x2001b2b8): [CID 0x2001b5cc]:[State 0x06]: >> Topic size 0x00000015, Data size 0x000005ba
00> [00:18:19.573,272] <dbg> net_mqtt_enc: pack_utf8_str: (0x2001b2b8): >> str_size:00000017 cur:0x2001f163, end:0x2001f35e
00> [00:18:19.573,303] <dbg> net_mqtt_enc: pack_uint16: (0x2001b2b8): >> val:0015 cur:0x2001f163, end:0x2001f35e
00> [00:18:19.573,303] <dbg> net_mqtt_enc: mqtt_encode_fixed_header: (0x2001b2b8): << msg type:0x30 length:0x000005d1
00> [00:18:19.573,333] <dbg> net_mqtt_enc: packet_length_encode: (0x2001b2b8): >> length:0x000005d1 cur:(nil), end:(nil)
00> [00:18:19.573,333] <dbg> net_mqtt_enc: mqtt_encode_fixed_header: (0x2001b2b8): Fixed header length = 03
00> [00:18:19.573,333] <dbg> net_mqtt_enc: pack_uint8: (0x2001b2b8): >> val:30 cur:0x2001f160, end:0x2001f35e
00> [00:18:19.573,364] <dbg> net_mqtt_enc: packet_length_encode: (0x2001b2b8): >> length:0x000005d1 cur:0x2001f161, end:0x2001f35e
00> [00:18:19.573,364] <dbg> net_mqtt: client_write_msg: (0x2001b2b8): [0x2001b5cc]: Transport writing message.
00> [00:18:19.577,117] <dbg> net_mqtt: client_write_msg: (0x2001b2b8): [0x2001b5cc]: Transport write complete.
00> [00:18:19.577,148] <dbg> net_mqtt: mqtt_publish: (0x2001b2b8): [CID 0x2001b5cc]:[State 0x06]: << result 0x00000000
00> [00:18:19.577,148] <inf> slm_mqtt: datamode send: 0
00> [00:18:20.137,756] <err> slm_mqtt: POLLERR
00> [00:18:20.137,786] <inf> net_mqtt_sock_tls: Closing socket 0
00> [00:18:20.139,099] <inf> slm_mqtt: MQTT thread terminated
00> [00:18:20.176,391] <inf> slm_at_host: time limit reached
00> [00:18:20.176,452] <inf> slm_at_host: Raw send 11
00> [00:18:20.176,483] <dbg> net_mqtt: mqtt_publish: (0x2001b2b8): [CID 0x2001b5cc]:[State 0x00]: >> Topic size 0x00000015, Data size 0x0000000b
00> [00:18:20.176,544] <dbg> net_mqtt: mqtt_publish: (0x2001b2b8): [CID 0x2001b5cc]:[State 0x00]: << result 0xffffff80
00> [00:18:20.176,574] <inf> slm_mqtt: datamode send: -128
00> [00:18:20.176,574] <wrn> slm_at_host: Raw send failed, 11 dropped
00> [00:18:20.176,605] <inf> slm_at_host: datamode off pending
00> [00:18:20.186,767] <inf> slm_at_host: Exit datamode

Parents
  • 0

    Hi Ye-Sheng,

    Thanks for checking with us. POLLERR means "Poll results in error conditions" in documents, so it does not give too much useful information. The error could be caused by a client, server, or something wrong with the connection.

    1) To help us get a better understanding of the behavior of the device. Could you record a modem trace including this failure? Please also share the whole log printout and tell us which MFW and NCS version you are using.

    2) It is also worth trying to test your client and server separately. like nRF9160 device+Publibe MQTT broker/ MQTT Client on PC+ You MQTT broker Cloud server.

    Best regards,

    Charlie

Reply
  • 0

    Hi Ye-Sheng,

    Thanks for checking with us. POLLERR means "Poll results in error conditions" in documents, so it does not give too much useful information. The error could be caused by a client, server, or something wrong with the connection.

    1) To help us get a better understanding of the behavior of the device. Could you record a modem trace including this failure? Please also share the whole log printout and tell us which MFW and NCS version you are using.

    2) It is also worth trying to test your client and server separately. like nRF9160 device+Publibe MQTT broker/ MQTT Client on PC+ You MQTT broker Cloud server.

    Best regards,

    Charlie

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