1 | // Copyright Benoit Blanchon 2014-2016
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2 | // MIT License
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3 | //
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4 | // Arduino JSON library
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5 | // https://github.com/bblanchon/ArduinoJson
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6 | // If you like this project, please add a star!
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7 |
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8 | #include <ArduinoJson.h>
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9 |
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10 | void setup() {
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11 | Serial.begin(9600);
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12 | while (!Serial) {
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13 | // wait serial port initialization
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14 | }
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15 |
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16 | // Memory pool for JSON object tree.
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17 | //
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18 | // Inside the brackets, 200 is the size of the pool in bytes,
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19 | // If the JSON object is more complex, you need to increase that value.
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20 | StaticJsonBuffer<200> jsonBuffer;
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21 |
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22 | // StaticJsonBuffer allocates memory on the stack, it can be
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23 | // replaced by DynamicJsonBuffer which allocates in the heap.
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24 | // It's simpler but less efficient.
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25 | //
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26 | // DynamicJsonBuffer jsonBuffer;
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27 |
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28 | // JSON input string.
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29 | //
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30 | // It's better to use a char[] as shown here.
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31 | // If you use a const char* or a String, ArduinoJson will
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32 | // have to make a copy of the input in the JsonBuffer.
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33 | char json[] =
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34 | "{\"sensor\":\"gps\",\"time\":1351824120,\"data\":[48.756080,2.302038]}";
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35 |
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36 | // Root of the object tree.
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37 | //
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38 | // It's a reference to the JsonObject, the actual bytes are inside the
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39 | // JsonBuffer with all the other nodes of the object tree.
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40 | // Memory is freed when jsonBuffer goes out of scope.
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41 | JsonObject& root = jsonBuffer.parseObject(json);
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42 |
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43 | // Test if parsing succeeds.
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44 | if (!root.success()) {
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45 | Serial.println("parseObject() failed");
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46 | return;
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47 | }
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48 |
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49 | // Fetch values.
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50 | //
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51 | // Most of the time, you can rely on the implicit casts.
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52 | // In other case, you can do root["time"].as<long>();
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53 | const char* sensor = root["sensor"];
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54 | long time = root["time"];
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55 | double latitude = root["data"][0];
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56 | double longitude = root["data"][1];
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57 |
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58 | // Print values.
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59 | Serial.println(sensor);
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60 | Serial.println(time);
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61 | Serial.println(latitude, 6);
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62 | Serial.println(longitude, 6);
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63 | }
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64 |
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65 | void loop() {
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66 | // not used in this example
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67 | }
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