main.cpp

00001 
00002 #include "mbed.h"
00003 #include "platform/mbed_thread.h"
00004 #include <MQTTClientMbedOs.h>
00005 #include "XNucleoIKS01A3.h"
00006 
00007 // Blinking rate in milliseconds
00008 #define BLINKING_RATE_MS                                                    500
00009 // Initialise the digital pin LED1 as an output
00010 DigitalOut led(LED1);
00011 
00012 /* Instantiate the expansion board */
00013 static XNucleoIKS01A3 *mems_expansion_board = XNucleoIKS01A3::instance(D14, D15, D4, D5, A3, D6, A4);
00014  
00015 /* Retrieve the composing elements of the expansion board */
00016 static STTS751Sensor *t_sensor = mems_expansion_board->t_sensor;
00017  
00018  
00019 volatile int mems_event = 0;
00020 uint32_t previous_tick = 0;
00021 uint32_t current_tick = 0;
00022 uint8_t high = 0, low = 0;
00023 float temperature = 0.0f;
00024 char buffer[32];
00025  
00026 void INT_cb();
00027  
00028 /* Helper function for printing floats & doubles */
00029 static char *print_double(char *str, double v, int decimalDigits = 2)
00030 {
00031     int i = 1;
00032     int intPart, fractPart;
00033     int len;
00034     char *ptr;
00035  
00036     /* prepare decimal digits multiplicator */
00037     for (; decimalDigits != 0; i *= 10, decimalDigits--);
00038  
00039     /* calculate integer & fractinal parts */
00040     intPart = (int)v;
00041     fractPart = (int)((v - (double)(int)v) * i);
00042  
00043     /* fill in integer part */
00044     sprintf(str, "%i.", intPart);
00045  
00046     /* prepare fill in of fractional part */
00047     len = strlen(str);
00048     ptr = &str[len];
00049  
00050     /* fill in leading fractional zeros */
00051     for (i /= 10; i > 1; i /= 10, ptr++) {
00052         if (fractPart >= i) {
00053             break;
00054         }
00055         *ptr = '0';
00056     }
00057  
00058     /* fill in (rest of) fractional part */
00059     sprintf(ptr, "%i", fractPart);
00060  
00061     return str;
00062 }
00063 
00064 InterruptIn button(USER_BUTTON);
00065 int arrivedcount = 0;
00066 TCPSocket socket;
00067 MQTTClient client(&socket);
00068 MQTT::Message message;
00069 int button_pressed=0;
00070 
00071 char* topic_pub = "PMK-client-temperature";
00072 char* topic_sub = "PMK-client-topic_sub";
00073 
00074 WiFiInterface *wifi;
00075 
00076 const char *sec2str(nsapi_security_t sec)
00077 {
00078     switch (sec) {
00079         case NSAPI_SECURITY_NONE:
00080             return "None";
00081         case NSAPI_SECURITY_WEP:
00082             return "WEP";
00083         case NSAPI_SECURITY_WPA:
00084             return "WPA";
00085         case NSAPI_SECURITY_WPA2:
00086             return "WPA2";
00087         case NSAPI_SECURITY_WPA_WPA2:
00088             return "WPA/WPA2";
00089         case NSAPI_SECURITY_UNKNOWN:
00090         default:
00091             return "Unknown";
00092     }
00093 }
00094 
00095 int scan_demo(WiFiInterface *wifi)
00096 {
00097     WiFiAccessPoint *ap;
00098     printf("Scan:\n");
00099     int count = wifi->scan(NULL,0);
00100     if (count <= 0) {
00101         printf("scan() failed with return value: %d\n", count);
00102         return 0;
00103     }
00104     /* Limit number of network arbitrary to 15 */
00105     count = count < 15 ? count : 15;
00106     ap = new WiFiAccessPoint[count];
00107     count = wifi->scan(ap, count);
00108     if (count <= 0) {
00109         printf("scan() failed with return value: %d\n", count);
00110         return 0;
00111     }
00112     for (int i = 0; i < count; i++) {
00113         printf("Network: %s secured: %s BSSID: %hhX:%hhX:%hhX:%hhx:%hhx:%hhx RSSI: %hhd Ch: %hhd\n", ap[i].get_ssid(),
00114                sec2str(ap[i].get_security()), ap[i].get_bssid()[0], ap[i].get_bssid()[1], ap[i].get_bssid()[2],
00115                ap[i].get_bssid()[3], ap[i].get_bssid()[4], ap[i].get_bssid()[5], ap[i].get_rssi(), ap[i].get_channel());
00116     }
00117     printf("%d networks available.\n", count);
00118     delete[] ap;
00119     return count;
00120 }
00121 
00122 void messageArrived(MQTT::MessageData& md)
00123 {
00124     MQTT::Message &message = md.message;
00125     printf("Message arrived: qos %d, retained %d, dup %d, packetid %d\r\n", message.qos, message.retained, message.dup, message.id);
00126     printf("Payload %.*s\r\n", message.payloadlen, (char*)message.payload);
00127     ++arrivedcount;
00128 }
00129 
00130 void buttonFunction() {    
00131     button_pressed=1;   
00132 }
00133 
00134 
00135 
00136 
00137 int main()
00138 {
00139     /* Attach callback to STTS751 INT */
00140     t_sensor->attach_int_irq(&INT_cb); 
00141     /* Enable STTS751 temperature sensor */
00142     t_sensor->enable();
00143     /* Set ODR to 4Hz */
00144     t_sensor->set_odr(4.0f);
00145     /* Set Low Temperature Threshold */
00146     t_sensor->set_low_temp_thr(22.0f);
00147     /* Set High Temperature Threshold */
00148     t_sensor->set_high_temp_thr(28.0f);
00149     /* Enable Event pin */
00150     t_sensor->set_event_pin(1);
00151     /* Get beginning status */
00152     t_sensor->get_temp_limit_status(NULL, NULL, NULL);
00153  
00154     button.rise(&buttonFunction);  // attach the address of the flip function to the rising edge
00155     
00156     const char* hostname = "broker.mqttdashboard.com";
00157     int port = 1883;    
00158     
00159     wifi = WiFiInterface::get_default_instance();
00160     if (!wifi) {
00161         printf("ERROR: No WiFiInterface found.\n");
00162         return -1;
00163     }
00164 
00165     int count = scan_demo(wifi);
00166     if (count == 0) {
00167         printf("No WIFI APs found - can't continue further.\n");
00168         return -1;
00169     }
00170 
00171     printf("\nConnecting to %s...\n", MBED_CONF_APP_WIFI_SSID);
00172     int ret = wifi->connect(MBED_CONF_APP_WIFI_SSID, MBED_CONF_APP_WIFI_PASSWORD, NSAPI_SECURITY_WPA_WPA2);
00173     if (ret != 0) {
00174         printf("\nConnection error: %d\n", ret);
00175         return -1;
00176     }
00177 
00178     printf("Success\n\n");
00179     printf("MAC: %s\n", wifi->get_mac_address());
00180     printf("IP: %s\n", wifi->get_ip_address());
00181     printf("Netmask: %s\n", wifi->get_netmask());
00182     printf("Gateway: %s\n", wifi->get_gateway());
00183     printf("RSSI: %d\n\n", wifi->get_rssi());
00184 
00185     socket.open(wifi);
00186     socket.connect(hostname, port);
00187     
00188     int rc=0;
00189     
00190     MQTTPacket_connectData data = MQTTPacket_connectData_initializer;
00191     data.MQTTVersion = 3;
00192     data.clientID.cstring = "PMK-client";
00193     //data.username.cstring = "testuser";
00194     //data.password.cstring = "testpassword";
00195     if ((rc = client.connect(data)) != 0)
00196         printf("rc from MQTT connect is %d\r\n", rc);
00197 
00198     if ((rc = client.subscribe(topic_sub, MQTT::QOS2, messageArrived)) != 0)
00199         printf("rc from MQTT subscribe is %d\r\n", rc);
00200 
00201     while (true) {
00202         t_sensor->get_temperature(&temperature);
00203         printf("Temp[C]: %7s C\r\n", print_double(buffer, temperature));
00204         led = !led;
00205         thread_sleep_for(BLINKING_RATE_MS);
00206         if (button_pressed==1) {
00207             button_pressed=0;    
00208             printf("Publishing data\r\n");    
00209             // QoS 0
00210             char buf[100];
00211             sprintf(buf, "Temp[C]: %7s C\r\n", print_double(buffer, temperature));
00212             message.qos = MQTT::QOS0;
00213             message.retained = false;
00214             message.dup = false;
00215             message.payload = (void*)buf;
00216             message.payloadlen = strlen(buf)+1;
00217             client.publish(topic_pub, message);
00218         }
00219         printf("Yielding"); 
00220         client.yield(1000);
00221         printf(" -> Yielded\r\n"); 
00222         
00223     }
00224 }
00225 
00226 void INT_cb()
00227 {
00228     mems_event = 1;
00229 }