MQTT Client example program. Ethernet connection is via an ENC28J60 module.
Dependencies: UIPEthernet MQTTClient
main.cpp@4:abcd50d71e61, 2015-11-28 (annotated)
- Committer:
- hudakz
- Date:
- Sat Nov 28 10:36:41 2015 +0000
- Revision:
- 4:abcd50d71e61
- Parent:
- 3:3e5f4d503a66
- Child:
- 5:c0716c55b302
Using DHCP to get IP address.
Who changed what in which revision?
User | Revision | Line number | New contents of line |
---|---|---|---|
hudakz | 2:6cd2390302ac | 1 | // In this example an MQTT client is created. |
hudakz | 2:6cd2390302ac | 2 | // It is publishing a simple 'example/hello' message with payload 'Hello World.' |
hudakz | 3:3e5f4d503a66 | 3 | // and subscribes to some messages assumably published by other client(s). |
hudakz | 3:3e5f4d503a66 | 4 | // Ethernet connection is assured by an ENC28J60 Ehernet module. |
hudakz | 0:158b106f3cfc | 5 | #include "mbed.h" |
hudakz | 0:158b106f3cfc | 6 | #include <UIPEthernet.h> |
hudakz | 0:158b106f3cfc | 7 | #include <UIPClient.h> |
hudakz | 0:158b106f3cfc | 8 | #include <MQTTClient.h> |
hudakz | 0:158b106f3cfc | 9 | #include <string> |
hudakz | 0:158b106f3cfc | 10 | |
hudakz | 2:6cd2390302ac | 11 | using namespace std; |
hudakz | 2:6cd2390302ac | 12 | |
hudakz | 2:6cd2390302ac | 13 | Serial pc(USBTX, USBRX); |
hudakz | 0:158b106f3cfc | 14 | |
hudakz | 3:3e5f4d503a66 | 15 | #define DHCP 1 // comment out this line if you'd like to use static IP address |
hudakz | 3:3e5f4d503a66 | 16 | |
hudakz | 0:158b106f3cfc | 17 | // UIPEthernet is the name of a global instance of UIPEthernetClass. |
hudakz | 0:158b106f3cfc | 18 | // Do not change the name! It is used within the UIPEthernet library. |
hudakz | 0:158b106f3cfc | 19 | // Adapt the SPI pin names to your mbed platform/board if not present yet. |
hudakz | 0:158b106f3cfc | 20 | #if defined(TARGET_LPC1768) |
hudakz | 2:6cd2390302ac | 21 | UIPEthernetClass UIPEthernet(p11, p12, p13, p8); // mosi, miso, sck, cs |
hudakz | 3:3e5f4d503a66 | 22 | #elif defined(TARGET_NUCLEO_F103RB) || defined(TARGET_NUCLEO_L152RE) || defined(TARGET_NUCLEO_F030R8) || defined(TARGET_NUCLEO_F401RE) \ |
hudakz | 3:3e5f4d503a66 | 23 | || defined(TARGET_NUCLEO_F302R8) || defined(TARGET_NUCLEO_L053R8) || defined(TARGET_NUCLEO_F411RE) || defined(TARGET_NUCLEO_F334R8) \ |
hudakz | 3:3e5f4d503a66 | 24 | || defined(TARGET_NUCLEO_F072RB) || defined(TARGET_NUCLEO_F091RC) || defined(TARGET_NUCLEO_F303RE) || defined(TARGET_NUCLEO_F070RB) \ |
hudakz | 3:3e5f4d503a66 | 25 | || defined(TARGET_KL25Z ) || defined(TARGET_KL46Z) || defined(TARGET_K64F) || defined(TARGET_KL05Z) \ |
hudakz | 3:3e5f4d503a66 | 26 | || defined(TARGET_K20D50M) || defined(TARGET_K22F) \ |
hudakz | 3:3e5f4d503a66 | 27 | || defined(TARGET_NRF51822) \ |
hudakz | 3:3e5f4d503a66 | 28 | || defined(TARGET_RZ_A1H) |
hudakz | 3:3e5f4d503a66 | 29 | UIPEthernetClass UIPEthernet(D11, D12, D13, D10); // mosi, miso, sck, cs |
hudakz | 0:158b106f3cfc | 30 | #endif |
hudakz | 0:158b106f3cfc | 31 | |
hudakz | 3:3e5f4d503a66 | 32 | // MAC number must be unique within the connected network. Modify as appropriate. |
hudakz | 2:6cd2390302ac | 33 | const uint8_t MY_MAC[6] = { 0x00, 0x01, 0x02, 0x03, 0x04, 0x05 }; |
hudakz | 3:3e5f4d503a66 | 34 | |
hudakz | 3:3e5f4d503a66 | 35 | #if !defined(DHCP) |
hudakz | 3:3e5f4d503a66 | 36 | // In case you'd like to use static IP address: |
hudakz | 3:3e5f4d503a66 | 37 | // IP address must be unique and compatible with your network. |
hudakz | 3:3e5f4d503a66 | 38 | // Change as appropriate. |
hudakz | 3:3e5f4d503a66 | 39 | const IPAddress MY_IP(192, 168, 1, 181); |
hudakz | 3:3e5f4d503a66 | 40 | #endif |
hudakz | 3:3e5f4d503a66 | 41 | |
hudakz | 3:3e5f4d503a66 | 42 | const int INTERVAL = 10; // Interval for publishing the messages (in seconds) |
hudakz | 3:3e5f4d503a66 | 43 | |
hudakz | 2:6cd2390302ac | 44 | char message_buff[100]; |
hudakz | 3:3e5f4d503a66 | 45 | |
hudakz | 3:3e5f4d503a66 | 46 | // MQTT broker is like a post office. |
hudakz | 3:3e5f4d503a66 | 47 | // Its task is to distribute messages published by clients to all subscribers (other clients). |
hudakz | 3:3e5f4d503a66 | 48 | // So the 'example/hello' messages published by this client will be sent to the broker. |
hudakz | 3:3e5f4d503a66 | 49 | // Then the broker will send them to all clients which subscribed to such topic (example/hello). |
hudakz | 3:3e5f4d503a66 | 50 | // Also this client will receive all messages with topics it subscribed to. |
hudakz | 3:3e5f4d503a66 | 51 | // 'Mosquitto' is a free implementation of MQTT broker for Linux machines (e.g. Raspberry Pi, Ubuntu etc.) |
hudakz | 3:3e5f4d503a66 | 52 | IPAddress serverIP(192, 168, 1, 30); // IP address of your MQTT broker (adapt) |
hudakz | 2:6cd2390302ac | 53 | EthernetClient ethernetClient; |
hudakz | 2:6cd2390302ac | 54 | void onMqttMessage(char* topic, uint8_t* payload, unsigned int length); |
hudakz | 2:6cd2390302ac | 55 | MQTTClient mqttClient(serverIP, 1883, onMqttMessage, ethernetClient); |
hudakz | 0:158b106f3cfc | 56 | |
hudakz | 2:6cd2390302ac | 57 | /** |
hudakz | 2:6cd2390302ac | 58 | * @brief |
hudakz | 2:6cd2390302ac | 59 | * @note |
hudakz | 2:6cd2390302ac | 60 | * @param |
hudakz | 2:6cd2390302ac | 61 | * @retval |
hudakz | 2:6cd2390302ac | 62 | */ |
hudakz | 2:6cd2390302ac | 63 | |
hudakz | 2:6cd2390302ac | 64 | int main(void) { |
hudakz | 0:158b106f3cfc | 65 | const int MAX_COUNT = 5; |
hudakz | 0:158b106f3cfc | 66 | int i = 0; |
hudakz | 0:158b106f3cfc | 67 | bool connected = false; |
hudakz | 0:158b106f3cfc | 68 | char* payload = "Hello World."; |
hudakz | 0:158b106f3cfc | 69 | time_t t = 0; |
hudakz | 0:158b106f3cfc | 70 | time_t lastTime = t; |
hudakz | 0:158b106f3cfc | 71 | |
hudakz | 0:158b106f3cfc | 72 | // initialize the ethernet device |
hudakz | 2:6cd2390302ac | 73 | |
hudakz | 3:3e5f4d503a66 | 74 | #if defined(DHCP) |
hudakz | 3:3e5f4d503a66 | 75 | pc.printf("Searching for DHCP server..\r\n"); |
hudakz | 3:3e5f4d503a66 | 76 | |
hudakz | 3:3e5f4d503a66 | 77 | if(UIPEthernet.begin(MY_MAC) != 1) { |
hudakz | 3:3e5f4d503a66 | 78 | pc.printf("No DHCP server found.\r\n"); |
hudakz | 3:3e5f4d503a66 | 79 | pc.printf("Exiting application.\r\n"); |
hudakz | 3:3e5f4d503a66 | 80 | return 0; |
hudakz | 3:3e5f4d503a66 | 81 | } |
hudakz | 3:3e5f4d503a66 | 82 | pc.printf("DHCP server found and configuration info received.\r\n"); |
hudakz | 3:3e5f4d503a66 | 83 | IPAddress localIP = UIPEthernet.localIP(); |
hudakz | 3:3e5f4d503a66 | 84 | pc.printf("Local IP = "); |
hudakz | 3:3e5f4d503a66 | 85 | for(uint8_t i = 0; i < 3; i++) |
hudakz | 3:3e5f4d503a66 | 86 | pc.printf("%d.", localIP[i]); |
hudakz | 3:3e5f4d503a66 | 87 | pc.printf("%d\r\n", localIP[3]); |
hudakz | 3:3e5f4d503a66 | 88 | #else |
hudakz | 1:49fb5754df16 | 89 | UIPEthernet.begin(MY_MAC, MY_IP); |
hudakz | 3:3e5f4d503a66 | 90 | #endif |
hudakz | 3:3e5f4d503a66 | 91 | |
hudakz | 2:6cd2390302ac | 92 | pc.printf("Connecting to MQTT broker ..\r\n"); |
hudakz | 2:6cd2390302ac | 93 | do |
hudakz | 2:6cd2390302ac | 94 | { |
hudakz | 0:158b106f3cfc | 95 | wait(1.0); |
hudakz | 0:158b106f3cfc | 96 | connected = mqttClient.connect("myMQTTHelloClient"); |
hudakz | 0:158b106f3cfc | 97 | } while(!connected && (i < MAX_COUNT)); |
hudakz | 0:158b106f3cfc | 98 | |
hudakz | 0:158b106f3cfc | 99 | if(connected) { |
hudakz | 2:6cd2390302ac | 100 | pc.printf("MQTT broker connected.\r\n"); |
hudakz | 3:3e5f4d503a66 | 101 | // The client can subscribe to as many topics as you like. |
hudakz | 3:3e5f4d503a66 | 102 | mqttClient.subscribe("outdoor/temperature"); |
hudakz | 3:3e5f4d503a66 | 103 | mqttClient.subscribe("boiler/outlet/temperature"); |
hudakz | 3:3e5f4d503a66 | 104 | pc.printf("Subscribed to the following topics:\r\n"); |
hudakz | 3:3e5f4d503a66 | 105 | pc.printf(" outdoor/temperature\r\n"); |
hudakz | 3:3e5f4d503a66 | 106 | pc.printf(" boiler/outlet/temperature\r\n"); |
hudakz | 2:6cd2390302ac | 107 | } |
hudakz | 2:6cd2390302ac | 108 | else { |
hudakz | 2:6cd2390302ac | 109 | pc.printf("Failed to connect to MQTT broker.\r\n"); |
hudakz | 0:158b106f3cfc | 110 | } |
hudakz | 0:158b106f3cfc | 111 | |
hudakz | 0:158b106f3cfc | 112 | while(1) { |
hudakz | 0:158b106f3cfc | 113 | t = time(NULL); |
hudakz | 0:158b106f3cfc | 114 | if(t > (lastTime + 5)) { |
hudakz | 0:158b106f3cfc | 115 | lastTime = t; |
hudakz | 0:158b106f3cfc | 116 | if(connected) { |
hudakz | 0:158b106f3cfc | 117 | mqttClient.publish("example/hello", payload); |
hudakz | 0:158b106f3cfc | 118 | pc.printf("Published: example/hello\r\n"); |
hudakz | 0:158b106f3cfc | 119 | } |
hudakz | 2:6cd2390302ac | 120 | } |
hudakz | 3:3e5f4d503a66 | 121 | mqttClient.loop(); // MQTT client loop processing (receiving messages) |
hudakz | 0:158b106f3cfc | 122 | } |
hudakz | 0:158b106f3cfc | 123 | } |
hudakz | 0:158b106f3cfc | 124 | |
hudakz | 2:6cd2390302ac | 125 | /** |
hudakz | 2:6cd2390302ac | 126 | * @brief Called on new MQTT message arrival |
hudakz | 2:6cd2390302ac | 127 | * @note |
hudakz | 2:6cd2390302ac | 128 | * @param topic: The topic of the new message |
hudakz | 2:6cd2390302ac | 129 | * payload: The payload of the new message |
hudakz | 2:6cd2390302ac | 130 | * length: Payload's length |
hudakz | 2:6cd2390302ac | 131 | * @retval |
hudakz | 2:6cd2390302ac | 132 | */ |
hudakz | 2:6cd2390302ac | 133 | void onMqttMessage(char* topic, uint8_t* payload, unsigned int length) { |
hudakz | 0:158b106f3cfc | 134 | int i = 0; |
hudakz | 0:158b106f3cfc | 135 | |
hudakz | 0:158b106f3cfc | 136 | pc.printf("Message arrived:\r\n"); |
hudakz | 3:3e5f4d503a66 | 137 | pc.printf(" Topic: %s\r\n", topic); |
hudakz | 3:3e5f4d503a66 | 138 | pc.printf(" Length: %d\r\n", length); |
hudakz | 0:158b106f3cfc | 139 | |
hudakz | 0:158b106f3cfc | 140 | // create character buffer with ending null terminator (string) |
hudakz | 0:158b106f3cfc | 141 | for(i = 0; i < length; i++) { |
hudakz | 0:158b106f3cfc | 142 | message_buff[i] = payload[i]; |
hudakz | 0:158b106f3cfc | 143 | } |
hudakz | 0:158b106f3cfc | 144 | |
hudakz | 0:158b106f3cfc | 145 | message_buff[i] = '\0'; |
hudakz | 4:abcd50d71e61 | 146 | pc.printf(" Payload: %s\r\n", message_buff); |
hudakz | 0:158b106f3cfc | 147 | } |