MQ Telemetry Transport client publishing parameters measured by a DHT11 sensor. Ethernet connection is via an ENC28J60 module.
Dependencies: DHT11 MQTTClient UIPEthernet mbed
main.cpp@0:092b5e724233, 2014-09-15 (annotated)
- Committer:
- hudakz
- Date:
- Mon Sep 15 17:08:18 2014 +0000
- Revision:
- 0:092b5e724233
- Child:
- 1:4be688be4e0d
rev. 00
Who changed what in which revision?
User | Revision | Line number | New contents of line |
---|---|---|---|
hudakz | 0:092b5e724233 | 1 | // In this example an MQTT client is created. |
hudakz | 0:092b5e724233 | 2 | // It is publishing parameters measured by a DHT11 sensor |
hudakz | 0:092b5e724233 | 3 | // UIPEthernet library is used to drive the ENC28J60 board |
hudakz | 0:092b5e724233 | 4 | #include <mbed.h> |
hudakz | 0:092b5e724233 | 5 | #include <UIPEthernet.h> |
hudakz | 0:092b5e724233 | 6 | #include <UIPClient.h> |
hudakz | 0:092b5e724233 | 7 | #include <MQTTClient.h> |
hudakz | 0:092b5e724233 | 8 | #include <DHT11.h> |
hudakz | 0:092b5e724233 | 9 | |
hudakz | 0:092b5e724233 | 10 | // UIPEthernet is the name of a global instance of UIPEthernetClass. |
hudakz | 0:092b5e724233 | 11 | // Do not change the name! It is used within the UIPEthernet library. |
hudakz | 0:092b5e724233 | 12 | // Adapt the SPI pin names to your mbed platform/board if not present yet. |
hudakz | 0:092b5e724233 | 13 | #if defined(TARGET_LPC1768) |
hudakz | 0:092b5e724233 | 14 | UIPEthernetClass UIPEthernet(p11, p12, p13, p8); // mosi, miso, sck, cs |
hudakz | 0:092b5e724233 | 15 | DHT11 dht11(p6); |
hudakz | 0:092b5e724233 | 16 | #elif defined (TARGET_NUCLEO_F103RB) |
hudakz | 0:092b5e724233 | 17 | UIPEthernetClass UIPEthernet(PB_5, PB_4, PB_3, PB_6); // mosi, miso, sck, cs |
hudakz | 0:092b5e724233 | 18 | DHT11 dht11(PC_14); |
hudakz | 0:092b5e724233 | 19 | #endif |
hudakz | 0:092b5e724233 | 20 | |
hudakz | 0:092b5e724233 | 21 | // Make sure that the MAC number is unique within the connected network. |
hudakz | 0:092b5e724233 | 22 | const uint8_t MY_MAC[6] = {0x00,0x01,0x02,0x03,0x04,0x05}; |
hudakz | 0:092b5e724233 | 23 | // IP address must be unique and compatible with your network too. Change as appropriate. |
hudakz | 0:092b5e724233 | 24 | const IPAddress MY_IP(192,168,1,181); |
hudakz | 0:092b5e724233 | 25 | char message_buff[100]; |
hudakz | 0:092b5e724233 | 26 | void onMessage(char* topic, uint8_t* payload, unsigned int length); |
hudakz | 0:092b5e724233 | 27 | IPAddress serverIP(192,168,1,30); // MQTT server (e.g. 'mosquitto' running on a Raspberry Pi or Ubuntu) |
hudakz | 0:092b5e724233 | 28 | EthernetClient ethernetClient; |
hudakz | 0:092b5e724233 | 29 | void onMqttMessage(char* topic, uint8_t* payload, unsigned int length); |
hudakz | 0:092b5e724233 | 30 | MQTTClient mqttClient(serverIP, 1883, onMqttMessage, ethernetClient); |
hudakz | 0:092b5e724233 | 31 | const int PERIOD = 10; // seconds |
hudakz | 0:092b5e724233 | 32 | |
hudakz | 0:092b5e724233 | 33 | Serial pc(USBTX, USBRX); |
hudakz | 0:092b5e724233 | 34 | |
hudakz | 0:092b5e724233 | 35 | int main() |
hudakz | 0:092b5e724233 | 36 | { |
hudakz | 0:092b5e724233 | 37 | const int MAX_COUNT = 5; |
hudakz | 0:092b5e724233 | 38 | int i = 0; |
hudakz | 0:092b5e724233 | 39 | bool connected = false; |
hudakz | 0:092b5e724233 | 40 | time_t t = 0; |
hudakz | 0:092b5e724233 | 41 | time_t lastTime = 0; |
hudakz | 0:092b5e724233 | 42 | |
hudakz | 0:092b5e724233 | 43 | // initialize the ethernet device |
hudakz | 0:092b5e724233 | 44 | Ethernet.begin(MY_MAC, MY_IP); |
hudakz | 0:092b5e724233 | 45 | pc.printf("Connecting to MQTT server ..\r\n"); |
hudakz | 0:092b5e724233 | 46 | do { |
hudakz | 0:092b5e724233 | 47 | wait(1.0); |
hudakz | 0:092b5e724233 | 48 | connected = mqttClient.connect("myMqttClient"); |
hudakz | 0:092b5e724233 | 49 | } while(!connected && (i < MAX_COUNT)); |
hudakz | 0:092b5e724233 | 50 | |
hudakz | 0:092b5e724233 | 51 | if(connected) { |
hudakz | 0:092b5e724233 | 52 | pc.printf("MQTT Server connected.\r\n"); |
hudakz | 0:092b5e724233 | 53 | mqttClient.subscribe("rt_clock"); |
hudakz | 0:092b5e724233 | 54 | pc.printf("Subscribed to: "); |
hudakz | 0:092b5e724233 | 55 | pc.printf("rt_clock\r\n"); |
hudakz | 0:092b5e724233 | 56 | } else { |
hudakz | 0:092b5e724233 | 57 | pc.printf("Failed to connect to MQTT server.\r\n"); |
hudakz | 0:092b5e724233 | 58 | } |
hudakz | 0:092b5e724233 | 59 | |
hudakz | 0:092b5e724233 | 60 | while(1) { |
hudakz | 0:092b5e724233 | 61 | t = time(NULL); |
hudakz | 0:092b5e724233 | 62 | if(t >= (lastTime + PERIOD)) { |
hudakz | 0:092b5e724233 | 63 | lastTime = t; |
hudakz | 0:092b5e724233 | 64 | if(connected) { |
hudakz | 0:092b5e724233 | 65 | sprintf(message_buff, "%ds:\r\n", t); |
hudakz | 0:092b5e724233 | 66 | pc.printf("---------------------\r\n"); |
hudakz | 0:092b5e724233 | 67 | pc.printf(message_buff); |
hudakz | 0:092b5e724233 | 68 | int state = dht11.readData(); |
hudakz | 0:092b5e724233 | 69 | if(state == DHT11::OK) { |
hudakz | 0:092b5e724233 | 70 | float hum = dht11.readHumidity(); |
hudakz | 0:092b5e724233 | 71 | sprintf(message_buff, "%4.1f", hum); |
hudakz | 0:092b5e724233 | 72 | pc.printf(" hum = %s%%\r\n", message_buff); |
hudakz | 0:092b5e724233 | 73 | mqttClient.publish("outdoor/humidity", message_buff); |
hudakz | 0:092b5e724233 | 74 | float temp = dht11.readTemperature(); |
hudakz | 0:092b5e724233 | 75 | sprintf(message_buff, "%5.1f", temp); |
hudakz | 0:092b5e724233 | 76 | pc.printf(" temp = %s'C\r\n", message_buff); |
hudakz | 0:092b5e724233 | 77 | mqttClient.publish("outdoor/temperature", message_buff); |
hudakz | 0:092b5e724233 | 78 | float dewPoint = temp - (100 - hum)/5.0; |
hudakz | 0:092b5e724233 | 79 | sprintf(message_buff, "%5.1f", dewPoint); |
hudakz | 0:092b5e724233 | 80 | pc.printf(" dew point = %s'C\r\n", message_buff); |
hudakz | 0:092b5e724233 | 81 | mqttClient.publish("outdoor/dewpoint", message_buff); |
hudakz | 0:092b5e724233 | 82 | } |
hudakz | 0:092b5e724233 | 83 | else |
hudakz | 0:092b5e724233 | 84 | pc.printf(" DHT11 error: %d\r\n", state); |
hudakz | 0:092b5e724233 | 85 | } |
hudakz | 0:092b5e724233 | 86 | } |
hudakz | 0:092b5e724233 | 87 | mqttClient.loop(); // MQTT client loop processing |
hudakz | 0:092b5e724233 | 88 | } |
hudakz | 0:092b5e724233 | 89 | } |
hudakz | 0:092b5e724233 | 90 | |
hudakz | 0:092b5e724233 | 91 | void onMqttMessage(char* topic, uint8_t* payload, unsigned int length) |
hudakz | 0:092b5e724233 | 92 | { |
hudakz | 0:092b5e724233 | 93 | int i = 0; |
hudakz | 0:092b5e724233 | 94 | |
hudakz | 0:092b5e724233 | 95 | pc.printf("Message arrived:\r\n"); |
hudakz | 0:092b5e724233 | 96 | pc.printf(" Topic: %s\r\n", topic); |
hudakz | 0:092b5e724233 | 97 | pc.printf(" Length: %d\r\n", length); |
hudakz | 0:092b5e724233 | 98 | |
hudakz | 0:092b5e724233 | 99 | // create character buffer with ending null terminator (string) |
hudakz | 0:092b5e724233 | 100 | for(i = 0; i < length; i++) { |
hudakz | 0:092b5e724233 | 101 | message_buff[i] = payload[i]; |
hudakz | 0:092b5e724233 | 102 | } |
hudakz | 0:092b5e724233 | 103 | |
hudakz | 0:092b5e724233 | 104 | message_buff[i] = '\0'; |
hudakz | 0:092b5e724233 | 105 | pc.printf(" Payload: %s\r\n", message_buff); |
hudakz | 0:092b5e724233 | 106 | } |
hudakz | 0:092b5e724233 | 107 | |
hudakz | 0:092b5e724233 | 108 | |
hudakz | 0:092b5e724233 | 109 | |
hudakz | 0:092b5e724233 | 110 |