Diff: main.cpp

Revision:

0:fae049daf5a1

diff -r 000000000000 -r fae049daf5a1 main.cpp
--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/main.cpp	Mon Sep 14 07:20:09 2020 +0000
@@ -0,0 +1,171 @@
+/*
+ * Copyright (c) 2020 Arm Limited
+ * SPDX-License-Identifier: Apache-2.0
+ */
+
+#include "mbed.h"
+#include "mbed_trace.h"
+#include "mbedtls/debug.h"
+#include "aws_credentials.h"
+
+extern "C" {
+// sdk initialization
+#include "iot_init.h"
+// mqtt methods
+#include "iot_mqtt.h"
+}
+
+// debugging facilities
+#define TRACE_GROUP "Main"
+static Mutex trace_mutex;
+static void trace_mutex_lock()
+{
+    trace_mutex.lock();
+}
+static void trace_mutex_unlock()
+{
+    trace_mutex.unlock();
+}
+extern "C" void aws_iot_puts(const char *msg) {
+    trace_mutex_lock();
+    puts(msg);
+    trace_mutex_unlock();
+}
+
+#define MQTT_TIMEOUT_MS    15000
+
+// subscription event handler
+static void on_message_received(void * pCallbackContext, IotMqttCallbackParam_t *pCallbackParam) {
+    auto wait_sem = static_cast<Semaphore*>(pCallbackContext);
+    char* payload = (char*)pCallbackParam->u.message.info.pPayload;
+    auto payloadLen = pCallbackParam->u.message.info.payloadLength;
+    tr_debug("from topic:%s; msg: %.*s", pCallbackParam->u.message.info.pTopicName, payloadLen, payload);
+
+    if (strncmp("Warning", payload, 7) != 0) {
+        tr_info("Hello %.*s !", payloadLen, payload);
+        wait_sem->release();
+    }
+}
+int main()
+{
+    mbed_trace_mutex_wait_function_set( trace_mutex_lock ); // only if thread safety is needed
+    mbed_trace_mutex_release_function_set( trace_mutex_unlock ); // only if thread safety is needed
+    mbed_trace_init();
+
+    tr_info("Connecting to the network...");
+    auto eth = NetworkInterface::get_default_instance();
+    if (eth == NULL) {
+        tr_error("No Network interface found.");
+        return -1;
+    }
+    auto ret = eth->connect();
+    if (ret != 0) {
+        tr_error("Connection error: %x", ret);
+        return -1;
+    }
+    tr_info("MAC: %s", eth->get_mac_address());
+    tr_info("Connection Success");
+
+    // demo :
+    // - Init sdk
+    if (!IotSdk_Init()) {
+        tr_error("AWS Sdk: failed to initialize IotSdk");
+        return -1;
+    }
+    auto init_status = IotMqtt_Init();
+    if (init_status != IOT_MQTT_SUCCESS) {
+        tr_error("AWS Sdk: Failed to initialize IotMqtt with %u", init_status);
+        return -1;
+    }
+    // - Connect to mqtt broker
+    IotMqttNetworkInfo_t network_info = IOT_MQTT_NETWORK_INFO_INITIALIZER;
+    network_info.pNetworkInterface = aws::get_iot_network_interface();
+    // create nework connection
+    network_info.createNetworkConnection = true;
+    network_info.u.setup.pNetworkServerInfo = {
+        .hostname = MBED_CONF_APP_AWS_ENDPOINT,
+        .port = 8883
+    };
+    network_info.u.setup.pNetworkCredentialInfo = {
+        .rootCA = aws::credentials::rootCA,
+        .clientCrt = aws::credentials::clientCrt,
+        .clientKey = aws::credentials::clientKey
+    };
+
+    IotMqttConnectInfo_t connect_info = IOT_MQTT_CONNECT_INFO_INITIALIZER;
+    connect_info.awsIotMqttMode = true; // we are connecting to aws servers
+    connect_info.pClientIdentifier = MBED_CONF_APP_AWS_CLIENT_IDENTIFIER;
+    connect_info.clientIdentifierLength = strlen(MBED_CONF_APP_AWS_CLIENT_IDENTIFIER);
+
+    IotMqttConnection_t connection = IOT_MQTT_CONNECTION_INITIALIZER;
+    auto connect_status = IotMqtt_Connect(&network_info, &connect_info, /* timeout ms */ MQTT_TIMEOUT_MS, &connection);
+    if (connect_status != IOT_MQTT_SUCCESS) {
+        tr_error("AWS Sdk: Connection to the MQTT broker failed with %u", connect_status);
+        return -1;
+    }
+    // - Subscribe to sdkTest/sub
+    //   On message
+    //   - Display on the console: "Hello %s", message
+    /* Set the members of the subscription. */
+    static const char topic[] = MBED_CONF_APP_AWS_MQTT_TOPIC;
+    Semaphore wait_sem {/* count */ 0, /* max_count */ 1};
+
+    IotMqttSubscription_t subscription = IOT_MQTT_SUBSCRIPTION_INITIALIZER;
+    subscription.qos = IOT_MQTT_QOS_1;
+    subscription.pTopicFilter = topic;
+    subscription.topicFilterLength = strlen(topic);
+    subscription.callback.function = on_message_received;
+    subscription.callback.pCallbackContext = &wait_sem;
+
+    /* Subscribe to the topic using the blocking SUBSCRIBE
+     * function. */
+    auto sub_status = IotMqtt_SubscribeSync(connection, &subscription,
+                                            /* subscription count */ 1, /* flags */ 0,
+                                            /* timeout ms */ MQTT_TIMEOUT_MS );
+    if (sub_status != IOT_MQTT_SUCCESS) {
+        tr_error("AWS Sdk: Subscribe failed with : %u", sub_status);
+    }
+
+    /* Set the members of the publish info. */
+    IotMqttPublishInfo_t publish = IOT_MQTT_PUBLISH_INFO_INITIALIZER;
+    publish.qos = IOT_MQTT_QOS_1;
+    publish.pTopicName = topic;
+    publish.topicNameLength = strlen(topic);
+    publish.retryLimit = 3;
+    publish.retryMs = 1000;
+    for (uint32_t i = 0; i < 10; i++) {
+        // - for i in 0..9
+        //  - wait up to 1 sec
+        //  - if no message received Publish: "You have %d sec remaining to say hello...", 10-i
+        //  - other wise, exit
+        if (wait_sem.try_acquire_for(1000)) {
+            break;
+        }
+
+        /* prepare the message */
+        static char message[64];
+        snprintf(message, 64, "Warning: Only %lu second(s) left to say your name !", 10 - i);
+        publish.pPayload = message;
+        publish.payloadLength = strlen(message);
+
+        /* Publish the message. */
+        tr_info("sending warning message: %s", message);
+        auto pub_status = IotMqtt_PublishSync(connection, &publish,
+                                              /* flags */ 0, /* timeout ms */ MQTT_TIMEOUT_MS);
+        if (pub_status != IOT_MQTT_SUCCESS) {
+            tr_warning("AWS Sdk: failed to publish message with %u.", pub_status);
+        }
+    }
+
+    /* Close the MQTT connection. */
+    IotMqtt_Disconnect(connection, 0);
+
+    IotMqtt_Cleanup();
+    IotSdk_Cleanup();
+
+    tr_info("Done");
+    while (true) {
+        ThisThread::sleep_for(1000);
+    }
+    return 0;
+}