MQTT Client example program. Ethernet connection is via an ENC28J60 module.
Dependencies: UIPEthernet MQTTClient
main.cpp@1:49fb5754df16, 2014-12-20 (annotated)
- Committer:
- hudakz
- Date:
- Sat Dec 20 12:04:36 2014 +0000
- Revision:
- 1:49fb5754df16
- Parent:
- 0:158b106f3cfc
- Child:
- 2:6cd2390302ac
rev 01
Who changed what in which revision?
User | Revision | Line number | New contents of line |
---|---|---|---|
hudakz | 1:49fb5754df16 | 1 | // In this example an MQTT client is created using an ENC28J60 |
hudakz | 0:158b106f3cfc | 2 | // It is publishing a simple 'example/hello' message 'Hello World.' |
hudakz | 0:158b106f3cfc | 3 | // and subscribes to 'outdoor/temperature' messages |
hudakz | 0:158b106f3cfc | 4 | // UIPEthernet library is used to drive the ENC28J60 |
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 | 0:158b106f3cfc | 11 | using namespace std; |
hudakz | 0:158b106f3cfc | 12 | |
hudakz | 0:158b106f3cfc | 13 | // UIPEthernet is the name of a global instance of UIPEthernetClass. |
hudakz | 0:158b106f3cfc | 14 | // Do not change the name! It is used within the UIPEthernet library. |
hudakz | 0:158b106f3cfc | 15 | // Adapt the SPI pin names to your mbed platform/board if not present yet. |
hudakz | 0:158b106f3cfc | 16 | #if defined(TARGET_LPC1768) |
hudakz | 0:158b106f3cfc | 17 | UIPEthernetClass UIPEthernet(p11, p12, p13, p8); // mosi, miso, sck, cs |
hudakz | 0:158b106f3cfc | 18 | #elif defined(TARGET_LPC1114) |
hudakz | 0:158b106f3cfc | 19 | UIPEthernetClass UIPEthernet(dp2, dp1, dp6, dp25); // mosi, miso, sck, cs |
hudakz | 0:158b106f3cfc | 20 | #elif defined(TARGET_LPC11U68) |
hudakz | 0:158b106f3cfc | 21 | UIPEthernetClass UIPEthernet(P0_9, P0_8, P1_29, P0_2); // mosi, miso, sck, cs |
hudakz | 0:158b106f3cfc | 22 | #elif defined (TARGET_NUCLEO_F103RB) |
hudakz | 0:158b106f3cfc | 23 | UIPEthernetClass UIPEthernet(PB_5, PB_4, PB_3, PB_6); // mosi, miso, sck, cs |
hudakz | 0:158b106f3cfc | 24 | #endif |
hudakz | 0:158b106f3cfc | 25 | |
hudakz | 1:49fb5754df16 | 26 | //Serial pc(PA_9, PA_10); |
hudakz | 1:49fb5754df16 | 27 | Serial pc(USBTX, USBRX); |
hudakz | 1:49fb5754df16 | 28 | |
hudakz | 0:158b106f3cfc | 29 | |
hudakz | 0:158b106f3cfc | 30 | // Make sure that the MAC number is unique within the connected network. |
hudakz | 0:158b106f3cfc | 31 | const uint8_t MY_MAC[6] = {0x00,0x01,0x02,0x03,0x04,0x05}; |
hudakz | 0:158b106f3cfc | 32 | // IP address must be unique and compatible with your network too. Change as appropriate. |
hudakz | 0:158b106f3cfc | 33 | const IPAddress MY_IP(192,168,1,181); |
hudakz | 0:158b106f3cfc | 34 | char message_buff[100]; |
hudakz | 0:158b106f3cfc | 35 | IPAddress serverIP(192,168,1,30); // MQTT server (e.g. 'mosquitto' running on a Ubuntu PC or Raspberry Pi) |
hudakz | 0:158b106f3cfc | 36 | EthernetClient ethernetClient; |
hudakz | 1:49fb5754df16 | 37 | void onMqttMessage(char* topic, uint8_t* payload, unsigned int length); |
hudakz | 0:158b106f3cfc | 38 | MQTTClient mqttClient(serverIP, 1883, onMqttMessage, ethernetClient); |
hudakz | 0:158b106f3cfc | 39 | |
hudakz | 0:158b106f3cfc | 40 | int main() |
hudakz | 0:158b106f3cfc | 41 | { |
hudakz | 0:158b106f3cfc | 42 | const int MAX_COUNT = 5; |
hudakz | 0:158b106f3cfc | 43 | int i = 0; |
hudakz | 0:158b106f3cfc | 44 | bool connected = false; |
hudakz | 0:158b106f3cfc | 45 | char* payload = "Hello World."; |
hudakz | 0:158b106f3cfc | 46 | time_t t = 0; |
hudakz | 0:158b106f3cfc | 47 | time_t lastTime = t; |
hudakz | 0:158b106f3cfc | 48 | |
hudakz | 0:158b106f3cfc | 49 | // initialize the ethernet device |
hudakz | 1:49fb5754df16 | 50 | UIPEthernet.begin(MY_MAC, MY_IP); |
hudakz | 1:49fb5754df16 | 51 | // IPAddress localIP = UIPEthernet.localIP(); |
hudakz | 0:158b106f3cfc | 52 | // pc.printf("IP = "); |
hudakz | 0:158b106f3cfc | 53 | // for(uint8_t i = 0; i < 3; i++) |
hudakz | 0:158b106f3cfc | 54 | // pc.printf("%d.", localIP[i]); |
hudakz | 0:158b106f3cfc | 55 | // pc.printf("%d\r\n", localIP[3]); |
hudakz | 0:158b106f3cfc | 56 | pc.printf("Connecting to MQTT server ..\r\n"); |
hudakz | 0:158b106f3cfc | 57 | do { |
hudakz | 0:158b106f3cfc | 58 | wait(1.0); |
hudakz | 0:158b106f3cfc | 59 | connected = mqttClient.connect("myMQTTHelloClient"); |
hudakz | 0:158b106f3cfc | 60 | } while(!connected && (i < MAX_COUNT)); |
hudakz | 0:158b106f3cfc | 61 | |
hudakz | 0:158b106f3cfc | 62 | if(connected) { |
hudakz | 0:158b106f3cfc | 63 | pc.printf("MQTT Server connected.\r\n"); |
hudakz | 0:158b106f3cfc | 64 | mqttClient.subscribe("outdoor/temperature"); |
hudakz | 0:158b106f3cfc | 65 | pc.printf("Subscribed to: outdoor/temperature\r\n"); |
hudakz | 0:158b106f3cfc | 66 | } else { |
hudakz | 0:158b106f3cfc | 67 | pc.printf("Failed to connect to MQTT server.\r\n"); |
hudakz | 0:158b106f3cfc | 68 | } |
hudakz | 0:158b106f3cfc | 69 | |
hudakz | 0:158b106f3cfc | 70 | while(1) { |
hudakz | 0:158b106f3cfc | 71 | t = time(NULL); |
hudakz | 0:158b106f3cfc | 72 | if(t > (lastTime + 5)) { |
hudakz | 0:158b106f3cfc | 73 | lastTime = t; |
hudakz | 0:158b106f3cfc | 74 | if(connected) { |
hudakz | 0:158b106f3cfc | 75 | mqttClient.publish("example/hello", payload); |
hudakz | 0:158b106f3cfc | 76 | pc.printf("Published: example/hello\r\n"); |
hudakz | 0:158b106f3cfc | 77 | } |
hudakz | 0:158b106f3cfc | 78 | |
hudakz | 0:158b106f3cfc | 79 | } |
hudakz | 0:158b106f3cfc | 80 | mqttClient.loop(); // MQTT client loop processing |
hudakz | 0:158b106f3cfc | 81 | } |
hudakz | 0:158b106f3cfc | 82 | } |
hudakz | 0:158b106f3cfc | 83 | |
hudakz | 0:158b106f3cfc | 84 | void onMqttMessage(char* topic, uint8_t* payload, unsigned int length) |
hudakz | 0:158b106f3cfc | 85 | { |
hudakz | 0:158b106f3cfc | 86 | int i = 0; |
hudakz | 0:158b106f3cfc | 87 | |
hudakz | 0:158b106f3cfc | 88 | pc.printf("Message arrived:\r\n"); |
hudakz | 0:158b106f3cfc | 89 | pc.printf(" Topic: %s\r\n", topic); |
hudakz | 0:158b106f3cfc | 90 | pc.printf(" Length: %d\r\n", length); |
hudakz | 0:158b106f3cfc | 91 | |
hudakz | 0:158b106f3cfc | 92 | // create character buffer with ending null terminator (string) |
hudakz | 0:158b106f3cfc | 93 | for(i = 0; i < length; i++) { |
hudakz | 0:158b106f3cfc | 94 | message_buff[i] = payload[i]; |
hudakz | 0:158b106f3cfc | 95 | } |
hudakz | 0:158b106f3cfc | 96 | |
hudakz | 0:158b106f3cfc | 97 | message_buff[i] = '\0'; |
hudakz | 0:158b106f3cfc | 98 | pc.printf(" Payload: %s\r\n", message_buff); |
hudakz | 0:158b106f3cfc | 99 | } |