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92 lines
2.8 KiB
C++
92 lines
2.8 KiB
C++
// ArduinoJson - arduinojson.org
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// Copyright Benoit Blanchon 2014-2018
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// MIT License
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//
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// This example shows how to deserialize a MessagePack document with
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// ArduinoJson.
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#include <ArduinoJson.h>
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void setup() {
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// Initialize serial port
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Serial.begin(9600);
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while (!Serial) continue;
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// Allocate the JSON document
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//
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// Inside the brackets, 200 is the size of the memory pool in bytes.
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// Don't forget to change this value to match your JSON document.
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// Use arduinojson.org/assistant to compute the capacity.
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StaticJsonDocument<200> doc;
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// StaticJsonObject allocates memory on the stack, it can be
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// replaced by DynamicJsonObject which allocates in the heap.
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//
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// DynamicJsonObject doc(200);
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// MessagePack input string.
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//
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// It's better to use a char[] as shown here.
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// If you use a const char* or a String, ArduinoJson will
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// have to make a copy of the input in the JsonBuffer.
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uint8_t input[] = {131, 166, 115, 101, 110, 115, 111, 114, 163, 103, 112, 115,
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164, 116, 105, 109, 101, 206, 80, 147, 50, 248, 164, 100,
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97, 116, 97, 146, 203, 64, 72, 96, 199, 58, 188, 148,
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112, 203, 64, 2, 106, 146, 230, 33, 49, 169};
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// This MessagePack document contains:
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// {
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// "sensor": "gps",
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// "time": 1351824120,
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// "data": [48.75608, 2.302038]
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// }
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// doc of the object tree.
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//
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// It's a reference to the JsonObject, the actual bytes are inside the
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// JsonBuffer with all the other nodes of the object tree.
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// Memory is freed when jsonBuffer goes out of scope.
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DeserializationError error = deserializeMsgPack(doc, input);
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// Test if parsing succeeds.
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if (error) {
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Serial.print("deserializeMsgPack() failed: ");
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Serial.println(error.c_str());
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return;
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}
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// Get the root object in the document
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JsonObject& root = doc.as<JsonObject>();
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// Fetch values.
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//
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// Most of the time, you can rely on the implicit casts.
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// In other case, you can do root["time"].as<long>();
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const char* sensor = root["sensor"];
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long time = root["time"];
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double latitude = root["data"][0];
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double longitude = root["data"][1];
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// Print values.
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Serial.println(sensor);
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Serial.println(time);
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Serial.println(latitude, 6);
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Serial.println(longitude, 6);
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}
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void loop() {
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// not used in this example
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}
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// See also
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// --------
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//
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// The website arduinojson.org contains the documentation for all the functions
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// used above. It also includes an FAQ that will help you solve any
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// deserialization problem.
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// Please check it out at: https://arduinojson.org/
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//
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// The book "Mastering ArduinoJson" contains a tutorial on deserialization.
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// It begins with a simple example, like the one above, and then adds more
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// features like deserializing directly from a file or an HTTP request.
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// Please check it out at: https://arduinojson.org/book/
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