1 | /*
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2 | This sketch establishes a TCP connection to a "quote of the day" service.
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3 | It sends a "hello" message, and then prints received data.
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4 | */
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5 |
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6 | #include <ESP8266WiFi.h>
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7 |
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8 | #ifndef STASSID
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9 | #define STASSID "shellyem3-3494547B8D61"
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10 | #define STAPSK ""
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11 | #endif
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12 |
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13 | const char* ssid = STASSID;
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14 | const char* password = STAPSK;
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15 |
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16 | const char* host = "192.168.33.1";
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17 | const uint16_t port = 80;
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18 |
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19 | void setup() {
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20 | Serial.begin(115200);
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21 |
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22 | // We start by connecting to a WiFi network
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23 |
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24 | Serial.println();
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25 | Serial.println();
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26 | Serial.print("Connecting to ");
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27 | Serial.println(ssid);
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28 |
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29 | /* Explicitly set the ESP8266 to be a WiFi-client, otherwise, it by default,
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30 | would try to act as both a client and an access-point and could cause
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31 | network-issues with your other WiFi-devices on your WiFi-network. */
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32 | WiFi.mode(WIFI_STA);
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33 | WiFi.begin(ssid, password);
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34 |
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35 | while (WiFi.status() != WL_CONNECTED) {
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36 | delay(500);
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37 | Serial.print(".");
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38 | }
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39 |
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40 | Serial.println("");
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41 | Serial.println("WiFi connected");
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42 | Serial.println("IP address: ");
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43 | Serial.println(WiFi.localIP());
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44 | }
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45 |
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46 | void loop() {
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47 | static bool wait = false;
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48 |
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49 | Serial.print("connecting to ");
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50 | Serial.print(host);
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51 | Serial.print(':');
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52 | Serial.println(port);
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53 |
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54 | // Use WiFiClient class to create TCP connections
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55 | WiFiClient client;
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56 | if (!client.connect(host, port)) {
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57 | Serial.println("connection failed");
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58 | delay(5000);
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59 | return;
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60 | }
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61 |
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62 | // This will send a string to the server
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63 | Serial.println("sending data to server");
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64 |
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65 |
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66 | if (client.connected()) { client.println("shellyem3-3494547B8D61/emeter/0?"); }
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67 |
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68 |
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69 |
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70 | // wait for data to be available
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71 | unsigned long timeout = millis();
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72 | while (client.available() == 0) {
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73 | if (millis() - timeout > 5000) {
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74 | Serial.println(">>> Client Timeout !");
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75 | client.stop();
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76 | delay(60000);
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77 | return;
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78 | }
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79 | }
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80 |
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81 | // Read all the lines of the reply from server and print them to Serial
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82 | Serial.println("receiving from remote server");
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83 | // not testing 'client.connected()' since we do not need to send data here
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84 | while (client.available()) {
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85 | char ch = static_cast<char>(client.read());
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86 | Serial.print(ch);
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87 | }
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88 |
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89 | // Close the connection
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90 | Serial.println();
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91 | Serial.println("closing connection");
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92 | client.stop();
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93 |
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94 | if (wait) {
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95 | delay(300000); // execute once every 5 minutes, don't flood remote service
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96 | }
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97 | wait = true;
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98 | }
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