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PAHO_C_SUB(1L) PAHO_C_SUB(1L) NAME paho_c_sub - receive (subscribe to) data from an MQTT server SYNOPSIS paho_c_sub [topic] [-t|--topic topic] [-c|--connection connection] [-h|--host hostname] [-p|--port portnumber] [-i|--clientid clientid] [-u|--username username] [-P|--password password] [-k|--keepalive keepalive-timeout] [-V|--MQTT-version 31|311|5] [-q|--qos 0|1|2] [-R|--no-retained] [--delimiter delimiter] [--no-de- limiter] [--quiet] [--verbose] [--trace min|max|error|protocol] [--will-topic will-topic] [--will-payload will-payload] [--will-retain] [--will-qos 0|1|2] [--cafile cafile] [--capath capath] [--cert certfile] [--key keyfile] [--keypass password] [--ciphers cipher-string] [--insecure] DESCRIPTION paho_c_sub receives data from an MQTT server using the Eclipse Paho C client asynchronous library (MQTTAsync). MQTT is a protocol, operating over TCP/IP, which allows programs to easily communicate with each other through a server. Messages are published to topics and delivered to any subscribers to those topics. The corresponding publisher pro- gram paho_c_pub allows MQTT messages to be sent. The default mode of operation is to output each message to stdout ter- minated by the delimiter. OPTIONS -t --topic The MQTT topic to publish the data to. -c --connection The MQTT URI to connect to, a combination of transport prefix, host, port and for websockets, topic. To connect using TCP use the tcp prefix, for example: tcp://localhost:1883. An example using SSL/TLS: ssl://localhost:1883. An example for websockets, insecure: ws://localhost:1883/topic, and secure: wss://local- host:80/topic. -h --host The TCP/IP host name of the MQTT server to connect to. Along with the --port option, an older alternative to using --connec- tion. -p --port The TCP/IP port number of the MQTT server to connect to. Along with the --host option, an older alternative to using --connec- tion. -q --qos The MQTT QoS on which to publish the message. The alternatives are 0, 1 or 2. -V --MQTTversion The version of the MQTT protocol to use. Valid options are 31 (or mqttv31), 311 (mqttv311) and 5 (or mqttv5). --quiet Do not print error messages. --trace Print library internal trace. Valid levels are min, max, error and rotocol. -R --no-retained Do not print messages which have the MQTT retained flag set. --delimiter The delimiter string to append to each message when printing. Defaults to newline. --no-delimiter Do not add a delimiter to each message when printing. --will-topic Sets the MQTT will message topic to publish to. If the applica- tion ends without sending an MQTT disconnect, the will message will be published to this topic. --will-payload Only used if will-topic is set. Sets the MQTT will message to be published. --will-qos Only used if will-topic is set. Sets the MQTT QoS at which the will message is published. The alternatives are 0, 1 or 2. --will-retain Only used if will-topic is set. Sets the MQTT retained flag on the will message. --cafile Only used with a TLS connection. The name of a file for the OpenSSL trust store. --capath Only used with a TLS connection. The name of a directory holding OpenSSL trusted certificates. --cert Only used with a TLS connection. The name of a file for the TLS keystore containing a client certificate to be presented. --key Only used with a TLS connection. The name of a file containing the client private key. --keypass Only used with a TLS connection. The password for the client private key file, if needed. --ciphers Only used with a TLS connection. A list of cipher suites that the client will present to the server during the TLS handshake. --insecure Only used with a TLS connection. Don't check that the server certificate common name matches the hostname. http://eclipse.org/paho 31 July 2018 (v1.3.0) PAHO_C_SUB(1L)
NAME | SYNOPSIS | DESCRIPTION | OPTIONS
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