examples: Add an MQTT-C example.
Signed-off-by: Abdelatif Guettouche <abdelatif.guettouche@espressif.com>
This commit is contained in:
Abdelatif Guettouche
Xiang Xiao
parent
e35ea9486e
commit
6ae35ffc71
31
examples/mqttc/Kconfig
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31
examples/mqttc/Kconfig
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#
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# For a description of the syntax of this configuration file,
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# see the file kconfig-language.txt in the NuttX tools repository.
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#
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config EXAMPLES_MQTTC
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tristate "Enable MQTT-C Example"
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default n
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depends on NETUTILS_MQTTC
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---help---
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Enable a simple MQTT-C publisher example
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if EXAMPLES_MQTTC
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config EXAMPLES_MQTTC_PROGNAME
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string "Program name"
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default "mqttc_pub"
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config EXAMPLES_MQTTC_STACKSIZE
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int "Task's stack size"
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default 8192
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config EXAMPLES_MQTTC_TXSIZE
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int "TX Buffer size"
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default 256
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config EXAMPLES_MQTTC_RXSIZE
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int "RX Buffer size"
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default 256
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endif
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23
examples/mqttc/Make.defs
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23
examples/mqttc/Make.defs
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############################################################################
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# apps/examples/mqttc/Make.defs
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#
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# Licensed to the Apache Software Foundation (ASF) under one or more
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# contributor license agreements. See the NOTICE file distributed with
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# this work for additional information regarding copyright ownership. The
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# ASF licenses this file to you under the Apache License, Version 2.0 (the
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# "License"); you may not use this file except in compliance with the
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# License. You may obtain a copy of the License at
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#
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# http://www.apache.org/licenses/LICENSE-2.0
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#
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# Unless required by applicable law or agreed to in writing, software
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# distributed under the License is distributed on an "AS IS" BASIS, WITHOUT
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# WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. See the
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# License for the specific language governing permissions and limitations
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# under the License.
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#
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############################################################################
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ifneq ($(CONFIG_EXAMPLES_MQTTC),)
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CONFIGURED_APPS += $(APPDIR)/examples/mqttc
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endif
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12
examples/mqttc/Makefile
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12
examples/mqttc/Makefile
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include $(APPDIR)/Make.defs
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PROGNAME = $(CONFIG_EXAMPLES_MQTTC_PROGNAME)
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PRIORITY = SCHED_PRIORITY_DEFAULT
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STACKSIZE = $(CONFIG_EXAMPLES_MQTTC_STACKSIZE)
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MODULE = $(CONFIG_EXAMPLES_MQTTC)
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# MQTT-C example source code
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MAINSRC = mqttc_pub.c
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include $(APPDIR)/Application.mk
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25
examples/mqttc/README.md
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25
examples/mqttc/README.md
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This is a simple MQTT publisher example using MQTT-C
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By default it publishes to the "test" topic and exits. Default behaviour
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including, host, port, topic, message and loop count can be changed through
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different arguments.
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To test:
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From the host start an MQTT broker and subscribe to the "test" topic. Here
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mosquitto is used:
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```
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mosquitto&
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mosquitto_sub -t test
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```
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Make sure that mosquitto is configured in local mode only.
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From the nsh:
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Launch the built-in app `mqttc_pub` specifying the host:
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```
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mqttc_pub -h HOST
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```
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The target will publish the message "test".
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321
examples/mqttc/mqttc_pub.c
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321
examples/mqttc/mqttc_pub.c
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/****************************************************************************
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* apps/examples/mqttc/mqttc_pub.c
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*
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* Licensed to the Apache Software Foundation (ASF) under one or more
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* contributor license agreements. See the NOTICE file distributed with
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* this work for additional information regarding copyright ownership. The
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* ASF licenses this file to you under the Apache License, Version 2.0 (the
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* "License"); you may not use this file except in compliance with the
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* License. You may obtain a copy of the License at
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*
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* http://www.apache.org/licenses/LICENSE-2.0
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*
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* Unless required by applicable law or agreed to in writing, software
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* distributed under the License is distributed on an "AS IS" BASIS, WITHOUT
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* WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. See the
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* License for the specific language governing permissions and limitations
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* under the License.
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*
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****************************************************************************/
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/****************************************************************************
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* Included Files
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****************************************************************************/
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#include <unistd.h>
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#include <stdlib.h>
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#include <stdio.h>
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#include <sys/socket.h>
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#include <fcntl.h>
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#include <netdb.h>
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#include <errno.h>
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#include <mqtt.h>
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/****************************************************************************
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* Pre-processor Definitions
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****************************************************************************/
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/****************************************************************************
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* Private Types
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****************************************************************************/
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struct mqttc_cfg_s
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{
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struct mqtt_client client;
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const FAR char *host;
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const FAR char *port;
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const FAR char *topic;
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const FAR char *msg;
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const FAR char *id;
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uint8_t sendbuf[CONFIG_EXAMPLES_MQTTC_TXSIZE];
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uint8_t recvbuf[CONFIG_EXAMPLES_MQTTC_RXSIZE];
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uint32_t tmo;
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uint8_t flags;
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uint8_t qos;
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};
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/****************************************************************************
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* Private Function Prototypes
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****************************************************************************/
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static FAR void *client_refresher(FAR void *data);
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static void parsearg(int argc, char *argv[], struct mqttc_cfg_s *cfg,
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int *n);
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static int initserver(const FAR struct mqttc_cfg_s *cfg);
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/****************************************************************************
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* Private Functions
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****************************************************************************/
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/****************************************************************************
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* Name: client_refresher
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*
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* Description:
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* The client's refresher. This function triggers back-end routines to
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* handle ingress/egress traffic to the broker.
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*
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****************************************************************************/
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static FAR void *client_refresher(FAR void *data)
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{
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while (1)
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{
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mqtt_sync((FAR struct mqtt_client *)data);
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usleep(100000U);
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}
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return NULL;
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}
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/****************************************************************************
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* Name: parsearg
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*
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* Description:
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* Parse command line arguments.
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*
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****************************************************************************/
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static void parsearg(int argc, char *argv[], struct mqttc_cfg_s *cfg, int *n)
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{
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int opt;
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while ((opt = getopt(argc, argv, "h:p:m:t:n:")) != ERROR)
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{
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switch (opt)
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{
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case 'h':
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cfg->host = optarg;
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break;
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case 'p':
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cfg->port = optarg;
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break;
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case 'm':
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cfg->msg = optarg;
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break;
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case 't':
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cfg->topic = optarg;
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break;
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case 'n':
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*n = strtol(optarg, NULL, 10);
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break;
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default:
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fprintf(stderr, "ERROR: Unrecognized option\n");
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break;
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}
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}
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}
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/****************************************************************************
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* Name: initserver
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*
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* Description:
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* Resolve server's name and try to establish a connection.
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*
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****************************************************************************/
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static int initserver(const FAR struct mqttc_cfg_s *cfg)
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{
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struct addrinfo hints;
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struct addrinfo *servinfo;
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struct addrinfo *itr;
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int fd;
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int ret;
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memset(&hints, 0, sizeof(hints));
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hints.ai_family = AF_INET;
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hints.ai_socktype = SOCK_STREAM;
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ret = getaddrinfo(cfg->host, cfg->port, &hints, &servinfo);
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if (ret < 0)
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{
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printf("ERROR! getaddrinfo() failed:%s\n", gai_strerror(ret));
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}
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itr = servinfo;
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do
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{
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fd = socket(itr->ai_family, itr->ai_socktype, itr->ai_protocol);
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if (fd < 0)
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{
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continue;
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}
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ret = connect(fd, itr->ai_addr, itr->ai_addrlen);
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if (ret == 0)
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{
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break;
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}
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close(fd);
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}
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while ((itr = itr->ai_next) != NULL);
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freeaddrinfo(servinfo);
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if (fd < 0)
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{
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printf("ERROR! Couldn't create socket\n");
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return -1;
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}
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ret = fcntl(fd, F_GETFL, 0);
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if (ret < 0)
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{
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printf("ERROR! fcntl() F_GETFL failed, errno:%d\n", errno);
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return -1;
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}
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ret = fcntl(fd, F_SETFL, ret | O_NONBLOCK);
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if (ret < 0)
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{
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printf("ERROR! fcntl() F_SETFL failed, errno:%d\n", errno);
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return -1;
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}
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return fd;
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}
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/****************************************************************************
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* Public Functions
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****************************************************************************/
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int main(int argc, char *argv[])
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{
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int sockfd;
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enum MQTTErrors mqtterr;
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pthread_t thrdid;
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int n = 1;
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struct mqttc_cfg_s mqtt_cfg =
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{
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.port = "1883",
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.topic = "test",
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.msg = "test",
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.flags = MQTT_CONNECT_CLEAN_SESSION,
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.tmo = 400,
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.id = NULL,
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.qos = MQTT_PUBLISH_QOS_0,
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};
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parsearg(argc, argv, &mqtt_cfg, &n);
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sockfd = initserver(&mqtt_cfg);
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if (sockfd < 0)
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{
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return -1;
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}
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mqtterr = mqtt_init(&mqtt_cfg.client, sockfd,
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mqtt_cfg.sendbuf, sizeof(mqtt_cfg.sendbuf),
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mqtt_cfg.recvbuf, sizeof(mqtt_cfg.recvbuf),
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NULL);
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if (mqtterr != MQTT_OK)
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{
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printf("ERRPR! mqtt_init() failed.\n");
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goto err_with_socket;
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}
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mqtterr = mqtt_connect(&mqtt_cfg.client, mqtt_cfg.id,
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NULL, /* Will topic */
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NULL, /* Will message */
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0, /* Will message size */
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NULL, /* User name */
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NULL, /* Password */
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mqtt_cfg.flags, mqtt_cfg.tmo);
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if (mqtterr != MQTT_OK)
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{
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printf("ERROR! mqtt_connect() failed\n");
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goto err_with_socket;
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}
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if (mqtt_cfg.client.error != MQTT_OK)
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{
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printf("error: %s\n", mqtt_error_str(mqtt_cfg.client.error));
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goto err_with_socket;
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}
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else
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{
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printf("Success: Connected to broker!\n");
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}
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/* Start a thread to refresh the client (handle egress and ingree client
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* traffic)
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*/
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if (pthread_create(&thrdid, NULL, client_refresher, &mqtt_cfg.client))
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{
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printf("ERROR! pthread_create() failed.\n");
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goto err_with_socket;
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}
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while (n--)
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{
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mqtterr = mqtt_publish(&mqtt_cfg.client, mqtt_cfg.topic,
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mqtt_cfg.msg, strlen(mqtt_cfg.msg) + 1,
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mqtt_cfg.qos);
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if (mqtterr != MQTT_OK)
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{
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printf("ERROR! mqtt_publish() failed\n");
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goto err_with_thrd;
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}
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if (mqtt_cfg.client.error != MQTT_OK)
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{
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printf("error: %s\n", mqtt_error_str(mqtt_cfg.client.error));
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goto err_with_thrd;
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}
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else
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{
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printf("Success: Published to broker!\n");
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}
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sleep(5);
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}
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printf("\nDisconnecting from %s\n\n", mqtt_cfg.host);
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mqtterr = mqtt_disconnect(&mqtt_cfg.client);
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if (mqtterr != MQTT_OK)
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{
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printf("ERROR! mqtt_disconnect() failed\n");
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}
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/* Force sending the DISCONNECT, the thread will be canceled before getting
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* the chance to sync this last packet.
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* Note however that close() would cleanly close the connection but only
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* through TCP (i.e. no MQTT DISCONNECT packet).
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*/
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mqtt_sync(&mqtt_cfg.client);
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err_with_thrd:
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pthread_cancel(thrdid);
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err_with_socket:
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close(sockfd);
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return 0;
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}
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