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https://github.com/eclipse/paho.mqtt-sn.embedded-c.git
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5fb4312aad
The purpose of this branch is to share work in process. Change sellect() of UDP to poll() Rewrite UDP6 for DTLS6 Known bug: can't reconnect DTLS Signed-off-by: tomoaki <tomoaki@tomy-tech.com>
212 lines
6.3 KiB
Markdown
212 lines
6.3 KiB
Markdown
# MQTT-SN Transparent / Aggregating Gateway
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MQTT-SN requires a MQTT-SN Gateway which acts as a protocol converter to convert MQTT-SN messages to MQTT messages.
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MQTT-SN client over SensorNetwork can not communicate directly with MQTT broker(TCP/IP).
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This Gateway can run as a transparent or aggregating Gateway by specifying the gateway.conf.
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### step1. Build the gateway
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copy and expand source code then,
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```
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$ cd paho.mqtt-sn.embedded-c/MQTTSNGateway
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```
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In order to build a gateway, one sensor network argument is required.
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```
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$ ./build.sh [udp|udp6|xbee|loralink|rfcomm]
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```
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MQTT-SNGateway and MQTT-SNLogmonitor (executable programs) are built in ./bin directory.
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### step2. Execute the Gateway.
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```
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$ cd bin
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$ ./MQTT-SNGateway
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```
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If you get the error message as follows:
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RingBuffer can't create a shared memory. ABORT Gateway!!!
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You have to start using sudo command only once for the first time.
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```
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$ sudo ./MQTT-SNGateway
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```
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## Contents of the gateway configuration file
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**gateway.conf** is in bin directory. It's contents are follows:
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```
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#**************************************************************************
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# Copyright (c) 2016-2021, Tomoaki Yamaguchi
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#
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# All rights reserved. This program and the accompanying materials
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# are made available under the terms of the Eclipse Public License v1.0
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# and Eclipse Distribution License v1.0 which accompany this distribution.
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#
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# The Eclipse Public License is available at
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# http://www.eclipse.org/legal/epl-v10.html
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# and the Eclipse Distribution License is available at
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# http://www.eclipse.org/org/documents/edl-v10.php.
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#***************************************************************************
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#
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# config file of MQTT-SN Gateway
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#
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GatewayID=1
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GatewayName=PahoGateway-01
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MaxNumberOfClients=30
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KeepAlive=60
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#LoginID=your_ID
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#Password=your_Password
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BrokerName=mqtt.eclipseprojects.io
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BrokerPortNo=1883
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BrokerSecurePortNo=8883
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```
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**GatewayID** is a gateway ID which used by GWINFO message.
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**GatewayName** is a name of the gateway.
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**MaxNumberOfClients** is a maxmum number of clients. Clients are dynamically allocated.
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**KeepAlive** is KeepAlive time in seconds.
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**LoginID** is used by CONNECT message.
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**Password** is used by CONNECT message.
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**BrokerName**is a domain name or IP address of a broker.
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**BrokerPortNo** is a broker's port no.
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**BrokerSecurePortNo** is a broker's port no of TLS connection.
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```
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#
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# CertsKey for TLS connections to a broker
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#
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#RootCAfile=/etc/ssl/certs/ca-certificates.crt
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#RootCApath=/etc/ssl/certs/
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#CertsKey=/path/to/certKey.pem
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#PrivateKey=/path/to/privateKey.pem
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```
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**RootCAfile** is a CA file name.
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**RootCApath** is a CA path. **SSL_CTX_load_verify_locations(ctx, CAfile, CApath)** function requires these parameters.
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**CertsKey** is a certificate pem file.
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**PrivateKey** is a private key pem file.
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Clients can connect to the broker via TLS by setting '**Secure Connection**' for each client in the client conf file.
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```
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#
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# When AggregatingGateway=YES or ClientAuthentication=YES,
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# All clients must be specified by the ClientList File
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#
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AggregatingGateway=NO
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QoS-1=NO
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Forwarder=NO
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PredefinedTopic=NO
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ClientAuthentication=NO
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ClientsList=/path/to/your_clients.conf
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PredefinedTopicList=/path/to/your_predefinedTopic.conf
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```
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The gateway runs as a aggregating gateway when **AggregatingGateway** is 'YES'.
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If **QoS-1** is 'YES, the gateway prepares a proxy for the QoS-1 client. QoS-1 client has a 'QoS-1' parameter in a clients.conf file. For QoS-1 clients, set the QoS-1 parameters in the clients.conf file.
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If **Forwarder** is 'YES', the gateway prepare a forwarder agent.
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If **ClientAuthentication** is 'YES', the client cannot connect unless it is registered in the clients.conf file.
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**ClientsList** defines clients and those address so on.
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**PredefinedTopicList** file defines Predefined Topic.
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```
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#==============================
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# SensorNetworks parameters
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#==============================
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#
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# UDP | DTLS
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#
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GatewayPortNo=10000
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MulticastPortNo=1883
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MulticastIP=225.1.1.1
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MulticastTTL=1
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```
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**GatewayPortNo** is a unicast port no of the gateway.
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**MulticastIP** and **MulticastPortNo** are for GWSEARCH messages. Clients can get the gateway address (Gateway IP address and GatewayPortNo) from GWINFO message by means of std::recvfrom().
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Client needs to know the MulticastIP and MulticastPortNo to send a SEARCHGW message.
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**MulticastTTL** is a multicast TTL.
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```
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#
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# UDP6 | DTLS6
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#
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GatewayIPv6PortNo=10000
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MulticastIPv6PortNo=1883
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MulticastIPv6=ff1e:feed:caca:dead::feed:caca:dead
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MulticastIPv6If=wlp4s0
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MulticastHops=1
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```
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**GatewayIPv6PortNo** is a unicast port no of the gateway.
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**MulticastIPv6PortNo** and **MulticastIPv6** are for GWSEARCH messages. Set the Global scope Multicast address so that the Global address is used for sending GWINFO.
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Clients can get the gateway address (Gateway IPv6 address and GatewayPortNo) from GWINFO message by means of std::recvfrom().
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**MulticastIPv6If** is a multicast interface name.
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**MulticastHops** is a multicast hops.
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```
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#
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# DTLS | DTLS6 DTLS CertsKey
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#
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DtlsCertsKey=/etc/ssl/certs/gateway.pem
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DtlsPrivKey=/etc/ssl/private/privkey.pem
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```
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**DtlsCertsKey** is a certs Key pem file for DTLS connection.
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**DtlsPrivKey** is a private key pem file for DTLS connection.
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```
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#
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# XBee
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#
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Baudrate=38400
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SerialDevice=/dev/ttyUSB0
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ApiMode=2
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```
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**Baudrate** is a baudrate of xbee.
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```
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#
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# LoRaLink
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#
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BaudrateLoRaLink=115200
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DeviceRxLoRaLink=/dev/loralinkRx
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DeviceTxLoRaLink=/dev/loralinkTx
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```
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https://github.com/ty4tw/MQTT-SN-LoRa
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```
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#
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# Bluetooth RFCOMM
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#
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RFCOMMAddress=60:57:18:06:8B:72.*
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```
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**RFCOMMAddress** is a bluetooth mac address and channel. channel should be * for the gateway.
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```
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#
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# LOG
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#
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ShearedMemory=NO
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```
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### How to monitor the gateway from a remote terminal.
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Change gateway.conf as follows:
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```
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# LOG
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ShearedMemory=YES;
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```
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Restart the gateway with sudo only once to create shared memories.
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open ssh terminal and execute LogMonitor.
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```
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$ cd bin
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$ ./MQTT-SNLogmonitor
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```
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Now you can get the Log on your terminal.
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##### Tips
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Use compiler definitions then you can get more precise logs.
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**-DDEBUG_NW** is a flag for debug logs of Sensor network.
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**-DDEBUG_MQTTSN** is a flag for debug logs of MQTT-SN message haandling.
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One or both flags can be specified.
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```
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./build.sh udp -DDEBUG -DDEBUG_NW
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```
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