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HW4
Fork of HelloMQTT by
main.cpp
- Committer:
- Dongho
- Date:
- 2018-01-05
- Revision:
- 23:e2ab0669caeb
- Parent:
- 21:a68bd76740f9
File content as of revision 23:e2ab0669caeb:
#define logMessage printf #define MQTTCLIENT_QOS2 1 #include "mbed.h" #include "easy-connect.h" #include "MQTTNetwork.h" #include "MQTTmbed.h" #include "MQTTClient.h" #define ADT7420_TEMP_REG (0x00) // Temperature Register #define ADT7420_CONF_REG (0x03) // Configuration Register #define EVAL_ADT7420_ADDR (0x48) // EVAL_ADT7420 i2c address /* connect this pin to both the CH_PD (aka EN) & RST pins on the ESP8266 just in case */ #define WIFI_HW_RESET_PIN D4 /* See if you can try using a hostname here */ #define MQTT_BROKER_ADDR "192.168.0.14" #define MQTT_BROKER_PORT 1883 DigitalOut wifiHwResetPin(WIFI_HW_RESET_PIN); DigitalOut led2(LED2); Serial pc(USBTX, USBRX); // computer to mbed boardSerial esp(D1, D0); I2C i2c(I2C_SDA, I2C_SCL); volatile bool flag = false; Mutex mqttMtx; char* topic1 = "LED"; char* topic2 = "TEMP"; void messageArrived(MQTT::MessageData& md) { MQTT::Message &message = md.message; /* our messaging standard says the first byte denotes which thread to fwd to */ logMessage("Message arrived: qos %d, retained %d, dup %d, packetid %d\r\n", message.qos, message.retained, message.dup, message.id); logMessage("Payload %.*s\r\n", message.payloadlen, (char*)message.payload); char fwdTarget = ((char *)message.payload)[0]; switch(fwdTarget) { case '0': // turn off led2 = 0; break; case '1': //turn on led2 = 1; break; default: pc.printf("Unknown MQTT message\n"); break; } } int main(int argc, char* argv[]) { float version = 0.5; pc.baud(115200); logMessage("MQTT example: version is %.2f\r\n", version); wait(0.2); //delay startup pc.printf("Resetting ESP8266 Hardware...\r\n"); wifiHwResetPin = 0; wait_ms(500); wifiHwResetPin = 1; pc.printf("Starting MQTT example with an ESP8266 wifi device using Mbed OS.\r\n"); pc.printf("Attempting to connect to access point...\r\n"); NetworkInterface* network = easy_connect(true); if (!network) { pc.printf("Error in east connection\r\n"); return -1; } MQTTNetwork mqttNetwork(network); MQTT::Client<MQTTNetwork, Countdown> client(mqttNetwork); logMessage("Connecting to %s:%d\r\n", MQTT_BROKER_ADDR, MQTT_BROKER_PORT); int rc = mqttNetwork.connect(MQTT_BROKER_ADDR, MQTT_BROKER_PORT); if (rc != 0) logMessage("rc from TCP connect is %d\r\n", rc); MQTTPacket_connectData data = MQTTPacket_connectData_initializer; data.MQTTVersion = 3; data.clientID.cstring = "mbed-kdh"; data.username.cstring = "kdh"; data.password.cstring = "2ehd2gh4"; if ((rc = client.connect(data)) != 0) logMessage("rc from MQTT connect is %d\r\n", rc); if ((rc = client.subscribe(topic1, MQTT::QOS0, messageArrived)) != 0) logMessage("rc from MQTT subscribe is %d\r\n", rc); int count = 0; int status; float temp; char data_write[2]; char data_read[2]; i2c.frequency(100000); // 100 k // 13-bit resolution and 1 SPS mode data_write[0] = ADT7420_CONF_REG; data_write[1] = 0x40; status = i2c.write((EVAL_ADT7420_ADDR << 1), data_write, 2); if (status != 0) { // error char buf[100]; MQTT::Message message; pc.printf("I2C configuration error!!\r\n"); sprintf(buf, "{ \"actions\": [ { \"name\": 'error' , \"parameter\": \"NaN\" } ] }"); pc.printf("%s\r\n", buf); message.qos = MQTT::QOS2; message.retained = false; message.dup = false; message.payload = (void*)buf; message.payloadlen = strlen(buf)+1; mqttMtx.lock(); rc = client.publish(topic2, message); mqttMtx.unlock(); while(1) { } } while(1) { Thread::wait(1000); char buf[100]; MQTT::Message message; if (count == 5) { // Read temperature register data_write[0] = ADT7420_TEMP_REG; i2c.write((EVAL_ADT7420_ADDR << 1), data_write, 1, 0); i2c.read(((EVAL_ADT7420_ADDR << 1) | 0x01), data_read, 2, 0); // Calculate temperature value in Celcius int tempval = ((int)data_read[0] << 8) | data_read[1]; tempval >>= 3; // tempval = 0x1e70; //test value for a negative temperature (-25.0) if ((tempval & 0x1000) > 0) { //negative value temp = (tempval - 8192)/16.0; } else { temp = tempval/16.0; } pc.printf("Publish: TEMP\r\n"); sprintf(buf, "%4.2f", temp); pc.printf("%s\r\n", buf); message.qos = MQTT::QOS2; message.retained = false; message.dup = false; message.payload = (void*)buf; message.payloadlen = strlen(buf)+1; mqttMtx.lock(); rc = client.publish(topic2, message); mqttMtx.unlock(); count = 0; } if(!client.isConnected()) NVIC_SystemReset(); // soft reset /* yield() needs to be called at least once per keepAliveInterval */ client.yield(10); count++; } return 0; }