MQTT-SN event: Retransmission retries limit has been reached

[Maboo]

Hi,

I am using an pca10059 as a SED together with a border router in my thread network. The SED shall publish every 5 min sensor data. That works fine. But after some time (randomly after 40 min or 6h) I get this error message via logger and I cant publish the sensor data anymore:

<info> app: MQTT-SN event: Retransmission retries limit has been reached.

<info> app: MQTT-SN event: Timed-out message: 5. Message ID: 0.

While testing where the problem lies, I added a pca10056 (SED) and got the same error at the same time for both devices.

These are my parameters for the SED devices (standard):

#define DEFAULT_CHILD_TIMEOUT    40                                         /**< Thread child timeout [s]. */
#define DEFAULT_POLL_PERIOD      1000                                       /**< Thread Sleepy End Device polling period when MQTT-SN Asleep. [ms] */
#define SHORT_POLL_PERIOD        100                                        /**< Thread Sleepy End Device polling period when MQTT-SN Awake. [ms] */
#define SEARCH_GATEWAY_TIMEOUT 5  

#define SCHED_QUEUE_SIZE      32                              /**< Maximum number of events in the scheduler queue. */
#define SCHED_EVENT_DATA_SIZE APP_TIMER_SCHED_EVENT_DATA_SIZE /**< Maximum app_scheduler event size. */

Do I have to change some timeout parameter for the gateway? Or does the thread network need at least one FTD next to the border router?

Ps: I use Linux, SDK17, VS-Code, pca10056/59

[Sigurd Hellesvik]

Hi Maboo

I do not think this is a property of the Thread network. The Border Router/Gateway should act as a FTD, and would in this case be the Thread Leader.

It is possibly a bug in the Gateway/Border Router.
Do you have access to debug logs from your Gateway?

In the meantime, I will also try to replicate the problem.

Regards,
Sigurd Hellesvik

[Maboo]

Hi Sigurd,

thanks for your reply. I tried to find a way to debug the gateway. The standard Paho-mqtt-sn-gateway seems to have a LogMonitor. But i couldn't find one within the nrf gateway (nrf border router image). Is there any LogMonitor available?

Thats my paho-mqtt-sn-gateway.conf:

#**************************************************************************
# Copyright (c) 2016-2019, Tomoaki Yamaguchi
#
# All rights reserved. This program and the accompanying materials
# are made available under the terms of the Eclipse Public License v1.0
# and Eclipse Distribution License v1.0 which accompany this distribution.
#
# The Eclipse Public License is available at
#    http://www.eclipse.org/legal/epl-v10.html
# and the Eclipse Distribution License is available at
#   http://www.eclipse.org/org/documents/edl-v10.php.
#***************************************************************************
#
# config file of MQTT-SN Gateway
#

# IPv4 Address of iot.eclipse.org
BrokerName=137.135.83.217
BrokerPortNo=1883
BrokerSecurePortNo=8883

#
# When AggregatingGateway=YES or ClientAuthentication=YES,
# All clients must be specified by the ClientList File
#

ClientAuthentication=NO
AggregatingGateway=NO
QoS-1=NO
Forwarder=NO

#ClientsList=/path/to/your_clients.conf

PredefinedTopic=NO
#PredefinedTopicList=/path/to/your_predefinedTopic.conf

#RootCAfile=/etc/ssl/certs/ca-certificates.crt
#RootCApath=/etc/ssl/certs/
#CertsFile=/path/to/certKey.pem
#PrivateKey=/path/to/privateKey.pem

GatewayID=1
GatewayName=PahoGateway-01
KeepAlive=900
#LoginID=your_ID
#Password=your_Password

# UDP
GatewayPortNo=10000
MulticastIP=225.1.1.1
MulticastPortNo=1883

# GatewayUDP6Broadcast address is set to all Thread devices address
# in order to enable Thread Sleepy Devices to receive multicast messages
# sent from the gateway.
# UDP6
GatewayUDP6Port = 47193
GatewayUDP6Broadcast = ff33:40:fdde:ad00:beef:0:0:1
GatewayUDP6If = wpan0

# XBee
Baudrate=38400
SerialDevice=/dev/ttyUSB0
ApiMode=2

# LOG
ShearedMemory=YES;

Regards Maboo

[Sigurd Hellesvik]

Hi

I do not know now how to read the log from the nRF Border Router.

However, there is this version of a Openthread Border Router with MQTT-SN support which is an alternative to using the nRF Border Router as a gateway.

In this OTBR, you can see the logs when you run the "docker run [...]" command.

If you are able to try this, it would be interesting to see both:
1. Is the error still happening with another version of the Gateway?
2. The error logs from this version.

If this is not possible for you to test, let me know, and I will try to dig for the logs in the nRF Border Router.

Regards,
Sigurd Hellesvik

[Maboo]

Hi,

unfortunately I do have some problems to get the OTBR running. I won't give up yet, but it would be very helpful, if you could ask around how the logs on the nRF BR work.

Thanks!

Maboo

[Sigurd Hellesvik]

Hi

I will set up a nRF5 Thread router and see if I am able to find MQTT-SN logs.
I hope to be done with this by Wednesday.

Regards,
Sigurd Hellesvik