Diff: main.cpp

Revision:

0:d20655cd1f3c

Child:

1:a2d8aec2bb92

--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/main.cpp	Fri Oct 07 18:30:51 2016 +0000
@@ -0,0 +1,183 @@
+/**
+* Example app for using the Cayenne MQTT C++ library to send and receive example data. This example uses
+* the X-NUCLEO-IDW01M1 WiFi expansion board via the X_NUCLEO_IDW01M1v2 library.
+*/
+
+#include "MQTTTimer.h"
+#include "CayenneMQTTClient.h"
+#include "MQTTNetworkIDW01M1.h"
+#include "SpwfInterface.h"
+
+// WiFi network info.
+char* ssid = "ssid";
+char* wifiPassword = "wifiPassword";
+
+// Cayenne authentication info. This should be obtained from the Cayenne Dashboard.
+char* username = "MQTT_USERNAME";
+char* clientID = "CLIENT_ID";
+char* password = "MQTT_PASSWORD";
+
+SpwfSAInterface interface(D8, D2); // TX, RX
+MQTTNetwork<SpwfSAInterface> network(interface);
+Cayenne::MQTTClient<MQTTNetwork<SpwfSAInterface>, MQTTTimer> mqttClient(network);
+
+/**
+* Print the message info.
+* @param[in] message The message received from the Cayenne server.
+*/
+void outputMessage(Cayenne::MessageData& message)
+{
+    switch (message.topic)  {
+    case COMMAND_TOPIC:
+        printf("topic=Command");
+        break;
+    case CONFIG_TOPIC:
+        printf("topic=Config");
+        break;
+    default:
+        printf("topic=%d", message.topic);
+        break;
+    }
+    printf(" channel=%d", message.channel);
+    if (message.clientID) {
+        printf(" clientID=%s", message.clientID);
+    }
+    if (message.type) {
+        printf(" type=%s", message.type);
+    }
+    for (size_t i = 0; i < message.valueCount; ++i) {
+        if (message.values[i].value) {
+            printf(" value=%s", message.values[i].value);
+        }
+        if (message.values[i].unit) {
+            printf(" unit=%s", message.values[i].unit);
+        }
+    }
+    if (message.id) {
+        printf(" id=%s", message.id);
+    }
+    printf("\n");
+}
+
+/**
+* Handle messages received from the Cayenne server.
+* @param[in] message The message received from the Cayenne server.
+*/
+void messageArrived(Cayenne::MessageData& message)
+{
+    int error = 0;
+    // Add code to process the message. Here we just ouput the message data.
+    outputMessage(message);
+
+    // If this is a command message we publish a response. Here we are just sending a default 'OK' response.
+    // An error response should be sent if there are issues processing the message.
+    if (message.topic == COMMAND_TOPIC && (error = mqttClient.publishResponse(message.channel, message.id, NULL, message.clientID)) != CAYENNE_SUCCESS) {
+        printf("Response failure, error: %d\n", error);
+    }
+}
+
+/**
+* Connect to the Cayenne server.
+* @return Returns CAYENNE_SUCCESS if the connection succeeds, or an error code otherwise.
+*/
+int connectClient(void)
+{
+    int error = 0;
+    // Connect to the server.
+    printf("Connecting to %s:%d\n", CAYENNE_DOMAIN, CAYENNE_PORT);
+    while ((error = network.connect(CAYENNE_DOMAIN, CAYENNE_PORT)) != 0) {
+        printf("TCP connect failed, error: %d\n", error);
+        wait(2);
+    }
+
+    if ((error = mqttClient.connect(username, clientID, password)) != MQTT::SUCCESS) {
+        printf("MQTT connect failed, error: %d\n", error);
+        return error;
+    }
+    printf("Connected\n");
+
+    // Subscribe to required topics.
+    if ((error = mqttClient.subscribe(COMMAND_TOPIC, CAYENNE_ALL_CHANNELS)) != CAYENNE_SUCCESS) {
+        printf("Subscription to Command topic failed, error: %d\n", error);
+    }
+    if ((error = mqttClient.subscribe(CONFIG_TOPIC, CAYENNE_ALL_CHANNELS)) != CAYENNE_SUCCESS) {
+        printf("Subscription to Config topic failed, error:%d\n", error);
+    }
+
+    // Send device info. Here we just send some example values for the system info. These should be changed to use actual system data, or removed if not needed.
+    mqttClient.publishData(SYS_VERSION_TOPIC, CAYENNE_NO_CHANNEL, NULL, NULL, CAYENNE_VERSION);
+    mqttClient.publishData(SYS_MODEL_TOPIC, CAYENNE_NO_CHANNEL, NULL, NULL, "mbedDevice");
+    mqttClient.publishData(SYS_CPU_MODEL_TOPIC, CAYENNE_NO_CHANNEL, NULL, NULL, "CPU Model");
+    mqttClient.publishData(SYS_CPU_SPEED_TOPIC, CAYENNE_NO_CHANNEL, NULL, NULL, "1000000000");
+
+    return CAYENNE_SUCCESS;
+}
+
+/**
+* Main loop where MQTT code is run.
+*/
+void loop(void)
+{
+    MQTTTimer timer(5000);
+
+    while (true) {
+        // Yield to allow MQTT message processing.
+        mqttClient.yield(1000);
+
+        // Check that we are still connected, if not, reconnect.
+        if (!network.connected() || !mqttClient.connected()) {
+            network.disconnect();
+            mqttClient.disconnect();
+            printf("Reconnecting\n");
+            while (connectClient() != CAYENNE_SUCCESS) {
+                wait(2);
+                printf("Reconnect failed, retrying\n");
+            }
+        }
+
+        // Publish some example data every few seconds. This should be changed to send your actual data to Cayenne.
+        if (timer.expired()) {
+            int error = 0;
+            if ((error = mqttClient.publishData(DATA_TOPIC, 0, TEMPERATURE, CELSIUS, 30.5)) != CAYENNE_SUCCESS) {
+                printf("Publish temperature failed, error: %d\n", error);
+            }
+            if ((error = mqttClient.publishData(DATA_TOPIC, 1, LUMINOSITY, LUX, 1000)) != CAYENNE_SUCCESS) {
+                printf("Publish luminosity failed, error: %d\n", error);
+            }
+            if ((error = mqttClient.publishData(DATA_TOPIC, 2, BAROMETRIC_PRESSURE, HECTOPASCAL, 800)) != CAYENNE_SUCCESS) {
+                printf("Publish barometric pressure failed, error: %d\n", error);
+            }
+            timer.countdown_ms(5000);
+        }
+    }
+}
+
+/**
+* Main function.
+*/
+int main()
+{   
+    // Initialize the network interface.
+    printf("Initializing interface\n");
+    interface.connect(ssid, wifiPassword, NSAPI_SECURITY_WPA2);
+
+    // Set the default function that receives Cayenne messages.
+    mqttClient.setDefaultMessageHandler(messageArrived);
+
+    // Connect to Cayenne.
+    if (connectClient() == CAYENNE_SUCCESS) {
+        // Run main loop.
+        loop();
+    }
+    else {
+        printf("Connection failed, exiting\n");
+    }
+
+    if (mqttClient.connected())
+        mqttClient.disconnect();
+    if (network.connected())
+        network.disconnect();
+
+    return 0;
+}
+