MQTT-SN Gateway crashing when enabling QoS-1 with the error "Max number of Clients"

Hi!

I am currently having some problems setting up the MQTT-SN Gateway (UDP mode). It is working fine as long as I am not enabling the QoS-1 mode in the gateway.conf file.

I am currently using the following configuration: gateway.conf:

#**************************************************************************
# Copyright (c) 2016-2021, 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
#

GatewayID=1
GatewayName=MQTTSNBridge
MaxNumberOfClients=30
KeepAlive=60
#LoginID=your_ID
#Password=your_Password

BrokerName=mosquitto
BrokerPortNo=1883
BrokerSecurePortNo=8883

#
# CertsKey for TLS connections to a broker
#

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

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

AggregatingGateway=NO
QoS-1=YES
Forwarder=NO
PredefinedTopic=YES
ClientAuthentication=NO
ClientsList=/etc/paho/clients.conf
PredefinedTopicList=/etc/paho/predefinedTopic.conf

#==============================
#  SensorNetworks parameters
#==============================
#
# UDP | DTLS 
# 

GatewayPortNo=10000
MulticastPortNo=1883
MulticastIP=225.1.1.1
MulticastTTL=1

#
# UDP6 | DTLS6
#

GatewayIPv6PortNo=10000
MulticastIPv6PortNo=1883
MulticastIPv6=ff1e:feed:caca:dead::1
MulticastIPv6If=wlp4s0
MulticastHops=1

#
# DTLS | DTLS6  
#

#DtlsCertsKey=/etc/ssl/certs/gateway.pem
#DtlsPrivKey=/etc/ssl/private/privkey.pem

#
# XBee
#

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

#
# LoRaLink
#

#BaudrateLoRaLink=115200
#DeviceRxLoRaLink=/dev/loralinkRx
#DeviceTxLoRaLink=/dev/loralinkTx

#
# Bluetooth RFCOMM
#

#RFCOMMAddress=60:57:18:06:8B:72.*

#
# LOG
#

ShearedMemory=NO

And this is the clients.conf file that I am currently using (Note that I am using a dummy IP address and this one will not be the final one)

#***********************************************************************
# Copyright (c) 2016, 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.
#***********************************************************************
#
# File format is:
#     Lines bigning with # are comment line.
#     ClientId, SensorNetAddress, "unstableLine", "secureConnection"
#     in case of UDP, SensorNetAddress format is IPAddress: port no.
#     if the SensorNetwork is not stable, specify "unstableLine".
#     if Broker's Connection is TLS, specify "secureConnection".
#     if the client is a forwarder,specify "forwarder".
#     if the client send PUBLISH QoS-1, specify "QoS-1".
#
# Ex:
#     #Client List
#     ClientId1,192.168.10.10:11200
#     ClientID2,192.168.50.200:35000,unstableLine
#     ClientID3,192.168.200.50:40000,secureConnection
#     ClientID4,192.168.200.52:41000,unstableLine,secureConnection
#     ClientID5,192.168.200.53:41000,unstableLine,secureConnection,QoS-1 
#     ClientID6,192.168.200.54:41000,unstableLine,secureConnection,forwarder
#
# SensorNetwork address format is defined by SensorNetAddress::setAddress(string* data) function.
#
# UDP6 (IPv6 UDP) [IPv6 address]:PortNo
# RFCOMM          Device_address.channel (1-30)
# XBee            FFFFFFFFFFFFFFFF　8bytes Hex
# LoRaLink        1-254 
#
#
# This is a sample of UDP. 
#
# REWRITE ALL ACCORDING TO YOUR CLIENTS.
#

#GatewayTester, 172.16.1.11:20020
#ClientPUB,172.16.1.11:2010
#Client01,172.16.1.11:12001
#Client02,172.16.1.11:12002
#Client03,172.16.1.11:13003

QoS-1_Client01,172.16.1.11:20001,QoS-1
# QoS-1_Client02,172.16.1.11:20002,QoS-1
# QoS-1_Client03,172.16.1.11:20003,QoS-1
# host.docker.internal
#Client,1.1.1.1:20001,unstableLine,QoS-1
# Forwarder01,172.16.1.11:22002,forwarder
# Forwarder01,172.16.1.11:22002,forwarder
# Forwarder02,172.16.1.11:22003,forwarder
# Forwarder03,172.16.1.11:22004,forwarder

The gateway is currently running in a docker container, but it also isn't working if I try to run it without docker. This is the Dockerfile I am currently using:

FROM alpine as builder
WORKDIR /usr/bin/app
RUN apk add git alpine-sdk bash cmake openssl-dev
RUN git clone https://github.com/eclipse/paho.mqtt-sn.embedded-c
RUN cd paho.mqtt-sn.embedded-c/MQTTSNGateway && \
    ./build.sh udp -DDEBUG_NW -DDEBUG_MQTTSN

FROM alpine as runner
WORKDIR /etc/paho
# RUN apk add alpine-sdk
RUN apk add --no-cache libgcc libstdc++ coreutils
COPY --from=builder /usr/local/lib /usr/local/lib
COPY --from=builder /usr/bin/app/paho.mqtt-sn.embedded-c/MQTTSNGateway/bin/ /etc/paho/
COPY --from=builder /usr/bin/app/paho.mqtt-sn.embedded-c/build.gateway/MQTTSNPacket/src/libMQTTSNPacket.so /lib
ENTRYPOINT [ "stdbuf", "-oL", "/etc/paho/MQTT-SNGateway"]

eclipse / paho.mqtt-sn.embedded-c

MQTT-SN Gateway crashing when enabling QoS-1 with the error "Max number of Clients" #263