UDP on openthread is not received

RE: UDP on openthread is not received

swap007 — Tue, 24 May 2022 19:24:57 GMT

Thead start -> wait for device to have their role in network -> udp open -> create buffer -> udp send

Address and port is not needed in initiation stage in otUdpOpen but it needs in otUDPsend().

Detailed:

- otUdpOpen ~ In this function parameter otUdpSocket does not need to be initalize with values. It can be memset(&m_socket, 0, sizeof(otUdpSocket)); otUdpReceive also need to be passed so, response can be seen when it receives

- otUdpSend ~ In this function parameter otMessageInfo, it need the address (in my case ff03::1) and port 1234

Note: I suggest Nordic to add this as an example, I have seen lot of people struggled on same issue in devzone forums.

Best,

Swap

RE: UDP on openthread is not received

Edvin — Tue, 24 May 2022 06:55:59 GMT

Glad to hear that you figured it out!

Do you mean that you only needed to set up the network before otUdpopen()? You didn't need to set it up to listen at a specific port number?

Best regards,

Edvin

RE: UDP on openthread is not received

swap007 — Tue, 24 May 2022 04:44:16 GMT

Actually, there was no error output of init function or send function. I wish otUdpOpen() function return error if thread network is not up.

FInally, I found the issue by try and error with help of CLI example.

One key piece was missed is : I should not be doing udp init before the thread network is up. Once I call the init function once both devices are part of openthread network, everything is fine.

Thank you for the help.

RE: UDP on openthread is not received

Edvin — Thu, 19 May 2022 13:17:32 GMT

I just want to confirm:

[quote user="swap007"], init_udp() and send_udp() is not printing any error[/quote]

Does that mean that you see "otUdpOpen SUCCESS" in the log, or that you don't see anything?

I am not sure about this one. We don't have any examples using this UDP other than deep inside "Matter", so it is not that easy to see how it is supposed to be used.

Assuming that this is Openthreads take on the UDP IP protocol, I would assume that it requires a bit more setup, such as an UDP port, which I assume will be part of the socket setup.

Perhaps you can try to both send and receive, but replace the other device (receiver and sender, respectively) with the CLI example.

Looking at the testing description it looks like you need to bind to a port, and there is a function called otUdpBind(), so I believe you need to call this from the receiver. From the description it looks like the 3rd parameter in otUdpBind() is an otSockAddr, which contains a port number.

Best regards,

Edvin

RE: UDP on openthread is not received

swap007 — Thu, 19 May 2022 02:36:10 GMT

I got an update. I think UDP packet is received by the net_openthead but it's not propogated to the callback passed in by otUdpOpen() function. ( I have not verified by nrf sniffer yet)

There are two devices in this screenshot. both devices are flashed with the code posted above.

left device addr- fe80:0:0:0:dc50:c721:81ac:8d9a:49153 send to ff02::1:1994 ----> received at right device

right device addr: fe80:0:0:0:24af:a408:99fc:72e5:49153 send to ff02::1:1994 -----> received at left device

Do I need to set any type of filter so, it can be seen in callback?

After adding CONFIG_OPENTHREAD_LOG_LEVEL_INFO=y, I saw the prints starting [INFO]-MAC-----:

prj.config

#
# Copyright (c) 2020 Nordic Semiconductor
#
# SPDX-License-Identifier: LicenseRef-Nordic-5-Clause
#

# nRF board library
CONFIG_DK_LIBRARY=y

#CONFIG_OPENTHREAD_NORDIC_LIBRARY_MASTER=y

# Enable CoAP utils and CoAP protocol
#CONFIG_COAP_UTILS=y


# Enable OpenThread CoAP support API
#CONFIG_OPENTHREAD_COAP=y

# Configure sample logging setting
CONFIG_LOG=y
CONFIG_OPENTHREAD_LOG_LEVEL_INFO=y
CONFIG_OPENTHREAD_DEBUG=y

# Adjust log strdup settings
CONFIG_LOG_STRDUP_MAX_STRING=512
CONFIG_LOG_STRDUP_BUF_COUNT=10

# Network shell
CONFIG_SHELL=y
CONFIG_OPENTHREAD_SHELL=y
CONFIG_SHELL_ARGC_MAX=26
CONFIG_SHELL_CMD_BUFF_SIZE=416

# Network sockets
CONFIG_NET_SOCKETS=y
CONFIG_NET_SOCKETS_POSIX_NAMES=y
CONFIG_NET_SOCKETS_POLL_MAX=4
CONFIG_NET_IPV6=y
CONFIG_NET_UDP=y

# Same network Master Key for client and server
CONFIG_OPENTHREAD_NETWORKKEY="00:11:22:33:44:55:66:77:88:99:aa:bb:cc:dd:ee:ff"

# L2 OpenThread enabling
CONFIG_NET_L2_OPENTHREAD=y

# Generic networking options
CONFIG_NETWORKING=y

CONFIG_ASSERT=y
CONFIG_ASSERT_NO_COND_INFO=y
CONFIG_MBEDTLS_SHA1_C=n
CONFIG_FPU=y

CONFIG_SHELL_BACKEND_SERIAL_INIT_PRIORITY=51

CONFIG_UART_LINE_CTRL=y
CONFIG_SHELL_BACKEND_SERIAL_CHECK_DTR=y
CONFIG_USB_CDC_ACM_LOG_LEVEL_OFF=y

CONFIG_USB_DEVICE_STACK=y
CONFIG_USB_DEVICE_MANUFACTURER="Nordic Semiconductor ASA"
CONFIG_USB_DEVICE_PRODUCT="Thread"
CONFIG_USB_DEVICE_VID=0x1915
CONFIG_USB_DEVICE_PID=0x0000

RE: UDP on openthread is not received

swap007 — Wed, 18 May 2022 17:29:55 GMT

I run same code on both devices posted above.

No, init_udp() and send_udp() is not printing any error.

RE: UDP on openthread is not received

Edvin — Wed, 18 May 2022 13:55:48 GMT

Hello,

On the receiver, does any of the function calls in init_udp() return any errors?

And on the receiver, does any of the function calls in send_udp() return any errors?

Best regards,

Edvin