1 | /*
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2 | PubNub sample subscribe client
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3 |
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4 | This sample client will subscribe to and handle raw PubNub messages
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5 | (not doing any JSON decoding). It does so with a randomly generated
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6 | UUID.
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7 |
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8 | Circuit:
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9 | * Ethernet shield attached to pins 10, 11, 12, 13
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10 | * (Optional.) LED on pin 8 for reception indication.
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11 | * Pin A4 unconnected (noise source for random number generator)
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12 |
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13 | created 23 October 2012
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14 | by Petr Baudis
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15 |
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16 | https://github.com/pubnub/pubnub-api/tree/master/arduino
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17 | This code is in the public domain.
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18 | */
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19 |
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20 | #include <SPI.h>
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21 | #include <Ethernet.h>
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22 | #include <PubNub.h>
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23 |
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24 | // Some Ethernet shields have a MAC address printed on a sticker on the shield;
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25 | // fill in that address here, or choose your own at random:
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26 | byte mac[] = { 0xDE, 0xAD, 0xBE, 0xEF, 0xFE, 0xED };
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27 |
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28 | const int subLedPin = 8;
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29 |
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30 | char pubkey[] = "demo";
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31 | char subkey[] = "demo";
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32 | char channel[] = "hello_world";
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33 | char uuid[] = "xxxxxxxx-xxxx-4444-9999-xxxxxxxxxxxx";
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34 |
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35 | void random_uuid() {
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36 | randomSeed(analogRead(4) + millis() * 1024);
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37 | snprintf(uuid, sizeof(uuid), "%04lx%04lx-%04lx-4444-9999-%04lx%04lx%04lx",
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38 | random(0x10000), random(0x10000), random(0x10000),
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39 | random(0x10000), random(0x10000), random(0x10000));
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40 | }
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41 |
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42 | void setup()
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43 | {
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44 | pinMode(subLedPin, OUTPUT);
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45 | digitalWrite(subLedPin, LOW);
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46 |
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47 | Serial.begin(9600);
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48 | Serial.println("Serial set up");
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49 |
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50 | while (!Ethernet.begin(mac)) {
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51 | Serial.println("Ethernet setup error");
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52 | delay(1000);
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53 | }
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54 | Serial.println("Ethernet set up");
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55 |
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56 | PubNub.begin(pubkey, subkey);
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57 | random_uuid();
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58 | PubNub.set_uuid(uuid);
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59 | Serial.println("PubNub set up");
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60 | }
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61 |
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62 | void flash(int ledPin)
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63 | {
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64 | /* Flash LED three times. */
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65 | for (int i = 0; i < 3; i++) {
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66 | digitalWrite(ledPin, HIGH);
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67 | delay(100);
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68 | digitalWrite(ledPin, LOW);
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69 | delay(100);
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70 | }
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71 | }
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72 |
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73 | void loop()
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74 | {
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75 | Ethernet.maintain();
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76 |
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77 | PubSubClient *client;
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78 |
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79 | Serial.println("waiting for a message (subscribe)");
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80 | client = PubNub.subscribe(channel);
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81 | if (!client) {
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82 | Serial.println("subscription error");
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83 | delay(1000);
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84 | return;
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85 | }
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86 | Serial.print("Received: ");
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87 | while (client->wait_for_data()) {
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88 | char c = client->read();
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89 | Serial.print(c);
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90 | }
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91 | client->stop();
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92 | Serial.println();
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93 | flash(subLedPin);
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94 |
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95 | delay(200);
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96 | }
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