Deserialize JSON using a cheap 433 Mhz reciever

433-json-receiver.ino

#include <Arduino.h>
// version 6
#include <ArduinoJson.h>
// same version as dronebot 433 video
#include <RH_ASK.h>
#include <SPI.h>

RH_ASK rf_driver;

void setup() {
  rf_driver.init();
  Serial.begin(9600);
  Serial.println("booted");
}

void loop() {
  uint8_t buf[RH_ASK_MAX_MESSAGE_LEN];  // 60 last time I checked
  uint8_t buflen = sizeof(buf);
  if (rf_driver.recv(buf, &buflen)) {
    // message received with valid checksum
    // rf_driver.printBuffer("printBuffer:", buf, buflen);
    
    // null terminate the buffer https://forum.arduino.cc/t/converting-a-uint8_t-buffer-to-char-array/556893/6
    buf[buflen] = '\0';
    Serial.println((char*)buf);

    // https://arduinojson.org/v6/example/parser/
    StaticJsonDocument<200> doc;
    DeserializationError error = deserializeJson(doc, (char*)buf);
    if (error) {
      Serial.print(F("deserializeJson() failed: "));
      Serial.println(error.f_str());
      return;
    }
    const char* command = doc["command"];
   
    Serial.print("command: ");
    Serial.println(command);
  }
}