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Trying monitor of sensors through smartphones
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mosquitto_pub(1) mosquitto_pub(1) NAME
mosquitto_pub - an mqtt version 3.1 client for publishing simple messages SYNOPSIS
mosquitto_pub [-d] [-h hostname] [-i client_id] [-I client id prefix] [-p port number] [-q message QoS] [--quiet] [-r] { -f file | -l | -m message | -n | -s} [ -u username [-P password] ] [ --will-topic topic [--will-payload payload] [--will-qos qos] [--will- retain] ] -t message-topic DESCRIPTION
mosquitto_pub is a simple mqtt version 3.1 client that will publish a single message on a topic and exit. OPTIONS
-d, --debug Enable debug messages. -f, --file Send the contents of a file as the message. -h, --host Specify the host to connect to. Defaults to localhost. -i, --id The id to use for this client. If not given, defaults to mosquitto_pub_ appended with the process id of the client. Cannot be used at the same time as the --id-prefix argument. -I, --id-prefix Provide a prefix that the client id will be built from by appending the process id of the client. This is useful where the broker is using the clientid_prefixes option. Cannot be used at the same time as the --id argument. -l, --stdin-line Send messages read from stdin, splitting separate lines into separate messages. Note that blank lines won't be sent. -m, --message Send a single message from the command line. -n, --null-message Send a null (zero length) message. -p, --port Connect to the port specified instead of the default 1883. -P, --pw Provide a password to be used for authenticating with the broker. Using this argument without also specifying a username is invalid. This requires a broker that supports MQTT v3.1. See also the --username option. -q, --qos Specify the quality of service to use for the message, from 0, 1 and 2. Defaults to 0. --quiet If this argument is given, no runtime errors will be printed. This excludes any error messages given in case of invalid user input (e.g. using --port without a port). -r, --retain If retain is given, the message will be retained as a "last know good" value on the broker. See mqtt(7) for more information. -s, --stdin-file Send a message read from stdin, sending the entire content as a single message. -t, --topic The mqtt topic on which to publish the message. See mqtt(7) for more information on mqtt topics. -u, --username Provide a username to be used for authenticating with the broker. This requires a broker that supports MQTT v3.1. See also the --pw argument. --will-payload Specify a message that will be stored by the broker and sent out if this client disconnects unexpectedly. This must be used in con- junction with --will-topic. --will-qos The QoS to use for the Will. Defaults to 0. This must be used in conjunction with --will-topic. --will-retain If given, if the client disconnects unexpectedly the message sent out will be treated as a retained message. This must be used in conjunction with --will-topic. --will-topic The topic on which to send a Will, in the event that the client disconnects unexpectedly. WILLS
mosquitto_sub can register a message with the broker that will be sent out if it disconnects unexpectedly. See mqtt(7) for more informa- tion. The minimum requirement for this is to use --will-topic to specify which topic the will should be sent out on. This will result in a non- retained, zero length message with QoS 0. Use the --will-retain, --will-payload and --will-qos arguments to modify the other will parameters. EXAMPLES
Publish temperature information to localhost with QoS 1: o mosquitto_pub -t sensors/temperature -m 32 -q 1 Publish timestamp and temperature information to a remote host on a non-standard port and QoS 0: o mosquitto_pub -h 192.168.1.1 -p 1885 -t sensors/temperature -m "1266193804 32" Publish light switch status. Message is set to retained because there may be a long period of time between light switch events: o mosquitto_pub -r -t switches/kitchen_lights/status -m "on" Send the contents of a file in two ways: o mosquitto_pub -t my/topic -f ./data o mosquitto_pub -t my/topic -s < ./data Send parsed electricity usage data from a Current Cost meter, reading from stdin with one line/reading as one message: o read_cc128.pl | mosquitto_pub -t sensors/cc128 -l BUGS
mosquitto_pub bug information can be found at http://launchpad.net/mosquitto SEE ALSO
mqtt(7) mosquitto_sub(1) mosquitto(8) libmosquitto(3) AUTHOR
Roger Light <roger@atchoo.org> 5 February 2012 mosquitto_pub(1)
