• State Not Answered
  • Replies 15 replies
  • Subscribers 69 subscribers
  • Views 1669 views
  • Users 0 members are here
Attachments (1) Download All
Nordic Case Info
  • Case ID: 304414
Options

Questions about testing the coap_client and coap_server demo while using openthread network

hyman

Hello,

        I Use the nRF52840DK and nRF21540DK to test the coap_client and coap_server demo ,SDK is ncs-2.2.0 ,IDE is VS Code .

        1. I want to extend the communication distance, so I use the nRF21540DK ,when compile the program ,the board which I selected is nrf21540dk_nrf52840 ,when finished compile ,I check the .config file in build/zephyr folder. and the config item was all add ,so I think my operation is OK.

# CONFIG_MPSL_FEM_ONLY is not set
CONFIG_MPSL_FEM_ANY_SUPPORT=y
CONFIG_MPSL_FEM_NRF21540_GPIO_SUPPORT=y
CONFIG_MPSL_FEM_NRF21540_GPIO_SPI_SUPPORT=y
CONFIG_MPSL_FEM_NCS_SUPPORTED_FEM_USED=y
CONFIG_MPSL_FEM_API_AVAILABLE=y
CONFIG_MPSL_FEM=y
CONFIG_MPSL_FEM_NRF21540_GPIO=y
# CONFIG_MPSL_FEM_NRF21540_GPIO_SPI is not set
CONFIG_MPSL_FEM_NRF21540_TX_GAIN_DB=10
CONFIG_MPSL_FEM_NRF21540_TX_GAIN_DB_POUTA=20
CONFIG_MPSL_FEM_NRF21540_TX_GAIN_DB_POUTB=10
CONFIG_MPSL_FEM_NRF21540_RX_GAIN_DB=13
# CONFIG_MPSL_FEM_NRF21540_RUNTIME_PA_GAIN_CONTROL is not set
# CONFIG_MPSL_FEM_POWER_MODEL is not set
CONFIG_MPSL_FEM_DEVICE_CONFIG_254=y
# CONFIG_MPSL_FEM_LOG_LEVEL_OFF is not set
# CONFIG_MPSL_FEM_LOG_LEVEL_ERR is not set
# CONFIG_MPSL_FEM_LOG_LEVEL_WRN is not set
# CONFIG_MPSL_FEM_LOG_LEVEL_INF is not set
CONFIG_MPSL_FEM_LOG_LEVEL_DBG=y
CONFIG_MPSL_FEM_LOG_LEVEL=4
CONFIG_MPSL_THREAD_COOP_PRIO=0
CONFIG_MPSL_WORK_STACK_SIZE=1024
CONFIG_MPSL_TIMESLOT_SESSION_COUNT=0
# CONFIG_MPSL_ASSERT_HANDLER is not set
# CONFIG_MPSL_LOG_LEVEL_OFF is not set
# CONFIG_MPSL_LOG_LEVEL_ERR is not set
# CONFIG_MPSL_LOG_LEVEL_WRN is not set
# CONFIG_MPSL_LOG_LEVEL_INF is not set
CONFIG_MPSL_LOG_LEVEL_DBG=y
CONFIG_MPSL_LOG_LEVEL=4

        To see the difference in transmission power ,I Use the nrf802154_sniffer and Wireshark to capture the packets of nRF52840DK and nRF21540DK ,I found the RSS display on Wireshark no difference ，the captured RSS are all -18dbm. 

        I tried to modify the tx power in conf as below ,but the captured RSS as the same .

CONFIG_MPSL_FEM_NRF21540_TX_GAIN_DB=20

        My question is that why captured RSS is the same ?

        I found thers is no log in nRF21540 module , What should I do to verify that nRF21540 really works ?

        2、When I captured the CoAP packets ,I found unique send Only send packet once ，but mesh multicast send will send packet four times , Wireshark show that three times are Retransmission ,in the four times transmission ,some transmission's RSS is -18dbm ,and some is -65dbm .as below .

        My question is that the feature of four transmissions while multicast ,Does this feature belong to the coap protocol or the thread protocol or developed in user application ?

        Why the RSS of four transmission is not the same ?

        

        Best Regards,

        Hyman

Parents
  • 0

    Hi,

    tried to modify the tx power in conf as below ,but the captured RSS as the same .
    My question is that why captured RSS is the same ?

    Can you try to upgrade to the latest version of nRF Connect SDK (v2.3.0)?

    My question is that the feature of four transmissions while multicast ,Does this feature belong to the coap protocol or the thread protocol or developed in user application ?

    This is from the Thread protocol. CoAP protocol will only retransmit messages if the sent message type was set to confirmable. You can also check that you see the similar behavior when sending multicast UDP messages.

    Why the RSS of four transmission is not the same ?

    The RSSI depends on the environment (noise/interference, obstacles, distance, etc), receiver, etc. RSSI is not a good indicator of the output power.

    Best regards,
    Jørgen

  • 0 in reply to Jørgen Holmefjord

    Hi,

            Thanks for your reply.

            I have seen the the retransmit messages while using UDP multicast .I want to know how to disable the characteristic of retransmission while using UDP multicast .

            When I test coap_client and coap_server demo ,I use nRF21540DK(select nRF21540DK_nRF52840 ) and nRF52840DK((select nRF52840DK_nRF52840 ) ),I want to evaluate nRF21540 ,but I can't see any log about nRF21540. I put the two DK very close to sniffer board (<5cm),I see the RSS is the same ,when I modify the conf of  nRF21540DK(select nRF21540DK_nRF52840 )  CONFIG_MPSL_FEM_NRF21540_TX_GAIN_DB from 10 to 20 ,I found the RSS also the same .so I don't think it works properly.

            Colud you help me how to let the nRF21540DK work properly？

            Thanks.

            Best Regards.

            Hyman.

Reply
  • 0 in reply to Jørgen Holmefjord

    Hi,

            Thanks for your reply.

            I have seen the the retransmit messages while using UDP multicast .I want to know how to disable the characteristic of retransmission while using UDP multicast .

            When I test coap_client and coap_server demo ,I use nRF21540DK(select nRF21540DK_nRF52840 ) and nRF52840DK((select nRF52840DK_nRF52840 ) ),I want to evaluate nRF21540 ,but I can't see any log about nRF21540. I put the two DK very close to sniffer board (<5cm),I see the RSS is the same ,when I modify the conf of  nRF21540DK(select nRF21540DK_nRF52840 )  CONFIG_MPSL_FEM_NRF21540_TX_GAIN_DB from 10 to 20 ,I found the RSS also the same .so I don't think it works properly.

            Colud you help me how to let the nRF21540DK work properly？

            Thanks.

            Best Regards.

            Hyman.

Children
No Data
Related