Example request for WiFiNINA #2065
Comments
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Hi @wittrup, I'm surprised you had to use buffers. Best regards, |
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Yes. Reproduced what I did first: // ArduinoJson - https://arduinojson.org
// Copyright © 2014-2024, Benoit BLANCHON
// MIT License
//
// This example shows how to store your project configuration in a file.
// It uses the SD library but can be easily modified for any other file-system.
//
// The file contains a JSON document with the following content:
// {
// "hostname": "examples.com",
// "port": 2731
// }
//
//
// https://arduinojson.org/v7/example/config/
#include <WiFiNINA.h>
#include <ArduinoJson.h>
// Our configuration structure.
struct Config {
char hostname[64];
int port;
};
const char* filename = "/fs/config.txt"; // File path
Config config; // <- global configuration object
// Loads the configuration from a file
void loadConfiguration(const char* filename, Config& config) {
// Open file for reading
WiFiStorageFile file = WiFiStorage.open(filename); // Open file for reading
// Allocate a temporary JsonDocument
JsonDocument doc;
// Deserialize the JSON document
DeserializationError error = deserializeJson(doc, file);
if (error)
Serial.println(F("Failed to read file, using default configuration"));
// Copy values from the JsonDocument to the Config
config.port = doc["port"] | 2731;
strlcpy(config.hostname, // <- destination
doc["hostname"] | "example.com", // <- source
sizeof(config.hostname)); // <- destination's capacity
// Close the file (Curiously, File's destructor doesn't close the file)
file.close();
}
// Saves the configuration to a file
void saveConfiguration(const char* filename, const Config& config) {
// Open file for writing
WiFiStorageFile file = WiFiStorage.open(filename); // Open file
if (file) {
file.erase(); // Erase existing file to overwrite
}
if (!file) {
Serial.println(F("Failed to create file"));
return;
}
// Allocate a temporary JsonDocument
JsonDocument doc;
// Set the values in the document
doc["hostname"] = config.hostname;
doc["port"] = config.port;
// Serialize JSON to file
if (serializeJson(doc, file) == 0) {
Serial.println(F("Failed to write to file"));
}
// Close the file
file.close();
}
// Prints the content of a file to the Serial
void printFile(const char* filename) {
// Open file for reading
WiFiStorageFile file = WiFiStorage.open(filename); // Open file for reading
if (!file) {
Serial.println(F("Failed to read file"));
return;
}
// Extract each characters by one by one
while (file.available()) {
Serial.print((char)file.read());
}
Serial.println();
// Close the file
file.close();
}
void setup() {
// Initialize serial port
Serial.begin(115200);
while ((!Serial) && (millis() < 3000)); // Wait until 3 seconds for Serial
while (!SD.begin(chipSelect)) {
Serial.println(F("Failed to initialize SD library"));
delay(1000);
}
// Should load default config if run for the first time
Serial.println(F("Loading configuration..."));
loadConfiguration(filename, config);
// Create configuration file
Serial.println(F("Saving configuration..."));
saveConfiguration(filename, config);
// Dump config file
Serial.println(F("Print config file..."));
printFile(filename);
}Verify generates the output: |
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I'm sorry, I didn't realize that |
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Once |
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I've merged together a working example of JsonConfigFile.ino and WiFiStorage.ino so that ArduinoJson can be used with Arduino Nano 33 IoT and others that use u-blox NINA-W102 (datasheet).
I'd like to have it improved, quality checked etc. and implemented as an example in ArduinoJson/examples/
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