MQTT demo program for Nucleo F401RE and Seeedstudio W5200 Ethernet Shield which is based on Wiznet IBMIoTClientEthernetExample_W5500.
Dependencies: MQTT W5200Interface mbed DHT11
Fork of IBMIoTClientEthernetExample_W5500 by
I post description regarding this source code here.
http://developer.mbed.org/users/hillkim7/notebook/ibmiotclientethernetexample_w5200/
main.cpp
- Committer:
- kaizen
- Date:
- 2014-09-26
- Revision:
- 0:910036879da0
- Child:
- 1:532d83b9f910
File content as of revision 0:910036879da0:
#include "mbed.h" #include "MQTTClient.h" #include "MQTTEthernet.h" // Configuration values needed to connect to IBM IoT Cloud #define QUICKSTARTMODE 1 #if (QUICKSTARTMODE) #define ORG "quickstart" #define ID "" #define AUTH_TOKEN "" #define TYPE "iotsample-mbed-lpc1768" #else #define ORG "Replace with your org" #define ID "Replace with your id" #define TYPE "Replace with your type" #define AUTH_TOKEN "Replace with your auth-token" #endif #define MQTT_PORT 1883 #define MQTT_TLS_PORT 8883 #define IBM_IOT_PORT MQTT_PORT #define MQTT_MAX_PACKET_SIZE 250 bool quickstartMode = (QUICKSTARTMODE) ? true : false; char org[11] = ORG; char type[30] = TYPE; char id[30] = ID; // mac without colons char auth_token[30] = AUTH_TOKEN; // Auth_token is only used in non-quickstart mode bool connected = false; char* getMac(EthernetInterface& eth, char* buf, int buflen) // Obtain MAC address { //strncpy(buf, eth.getMACAddress(), buflen); strncpy(buf,"00:02:f7:f2:05:00",buflen); char* pos; // Remove colons from mac address while ((pos = strchr(buf, ':')) != NULL) memmove(pos, pos + 1, strlen(pos) + 1); return buf; } int connect(MQTT::Client<MQTTEthernet, Countdown, MQTT_MAX_PACKET_SIZE>* client, MQTTEthernet* ipstack) { const char* iot_ibm = ".messaging.internetofthings.ibmcloud.com"; char hostname[strlen(org) + strlen(iot_ibm) + 1]; sprintf(hostname, "%s%s", org, iot_ibm); int rc = ipstack->connect(hostname, IBM_IOT_PORT); if (rc != 0) return rc; // Construct clientId - d:org:type:id char clientId[strlen(org) + strlen(type) + strlen(id) + 5]; sprintf(clientId, "d:%s:%s:%s", org, type, id); DEBUG("clientid is %s\r\n", clientId); // MQTT Connect MQTTPacket_connectData data = MQTTPacket_connectData_initializer; data.MQTTVersion = 3; data.clientID.cstring = clientId; if (!quickstartMode) { data.username.cstring = "use-token-auth"; data.password.cstring = auth_token; } if ((rc = client->connect(&data)) == 0) { connected = true; } return rc; } int getConnTimeout(int attemptNumber) { // First 10 attempts try within 3 seconds, next 10 attempts retry after every 1 minute // after 20 attempts, retry every 10 minutes return (attemptNumber < 10) ? 3 : (attemptNumber < 20) ? 60 : 600; } void attemptConnect(MQTT::Client<MQTTEthernet, Countdown, MQTT_MAX_PACKET_SIZE>* client, MQTTEthernet* ipstack) { int retryAttempt = 0; connected = false; // make sure a cable is connected before starting to connect while ( !ipstack->getEth().linkstatus() ) { wait(1.0f); WARN("Ethernet link not present. Check cable connection\r\n"); } while (connect(client, ipstack) != 0) { int timeout = getConnTimeout(++retryAttempt); WARN("Retry attempt number %d waiting %d\r\n", retryAttempt, timeout); wait(timeout); } } int publish(MQTT::Client<MQTTEthernet, Countdown, MQTT_MAX_PACKET_SIZE>* client, MQTTEthernet* ipstack) { MQTT::Message message; char* pubTopic = "iot-2/evt/status/fmt/json"; char buf[250]; sprintf(buf, "{\"d\":{\"myName\":\"IoT mbed\",\"accelX\":%0.4f,\"accelY\":%0.4f,\"accelZ\":%0.4f,\"temp\":%0.4f,\"joystick\":\"%s\",\"potentiometer1\":%0.4f,\"potentiometer2\":%0.4f}}", 12.4, 22.3, 12.2, 25.3, "up", 12.3, 22.1); message.qos = MQTT::QOS0; message.retained = false; message.dup = false; message.payload = (void*)buf; message.payloadlen = strlen(buf); LOG("Publishing %s\r\n", buf); return client->publish(pubTopic, &message); } void messageArrived(MQTT::MessageData& md) { MQTT::Message &message = md.message; char topic[md.topicName.lenstring.len + 1]; sprintf(topic, "%.*s", md.topicName.lenstring.len, md.topicName.lenstring.data); LOG("Message arrived on topic %s: %.*s\r\n", topic, message.payloadlen, message.payload); // Command topic: iot-2/cmd/blink/fmt/json - cmd is the string between cmd/ and /fmt/ char* start = strstr(topic, "/cmd/") + 5; int len = strstr(topic, "/fmt/") - start; if (memcmp(start, "blink", len) == 0) { char payload[message.payloadlen + 1]; sprintf(payload, "%.*s", message.payloadlen, (char*)message.payload); char* pos = strchr(payload, '}'); if (pos != NULL) { *pos = '\0'; if ((pos = strchr(payload, ':')) != NULL) { } } } else WARN("Unsupported command: %.*s\r\n", len, start); } int main() { Serial pc(USBTX, USBRX); pc.baud(115200); SPI spi(D11, D12, D13); // mosi, miso, sclk wait(1); MQTTEthernet ipstack(&spi, D10, D9); //scs(D10), nRESET(PTA20) MQTT::Client<MQTTEthernet, Countdown, MQTT_MAX_PACKET_SIZE> client(ipstack); if (quickstartMode ) { getMac(ipstack.getEth(), id, sizeof(id)); } attemptConnect(&client, &ipstack); if (!quickstartMode) { int rc = 0; if ((rc = client.subscribe("iot-2/cmd/+/fmt/json", MQTT::QOS1, messageArrived)) != 0) WARN("rc from MQTT subscribe is %d\r\n", rc); } int count = 0; while (true) { if (!ipstack.getEth().linkstatus()) { NVIC_SystemReset(); // if ipstack and client were on the heap we could deconstruct and goto a label where they are constructed // or maybe just add the proper members to do this disconnect and call attemptConnect(...) } if (++count == 100) { // Publish a message every second if (publish(&client, &ipstack) != 0) attemptConnect(&client, &ipstack); // if we have lost the connection count = 0; } client.yield(10); // allow the MQTT client to receive messages } }