I am newbie in ESP32 programming and in embedded systems themselves. So sorry in advance if I ask something widely knwon or stupid.
I have a question regarding storage and handling of global config for my device. I have a ESP32 board with two sensors attached to it. I need to be able to change individual sensor config via BLE.
Each sensor is being represented as a instance of Sensor class.
I want to implement JSON config like this:
Code: Select all
{
"golbal_param1":"value"
"golbal_param2":"value"
"golbal_param3":"value"
"sensors":[
{
"id":"sensor0",
"pin": 0,
"calibrated": false,
"threshold": 0,
"jsonParam1": { }
},
{
"id":"sensor1",
"pin": 1,
"calibrated": false,
"threshold": 0,
"jsonParam1": { }
}
]
}
Code: Select all
#ifndef SENSOR_H
#define SENSOR_H
#if defined(ARDUINO) && ARDUINO >= 100
#include "Arduino.h"
#else
#include "WProgram.h"
#endif
#include <ArduinoJson.h>
#include "constants.h"
#include "ADS1X15.h"
#include "SignalSequence.h"
using namespace B;
class sensor {
public:
String id;
private:
struct SensorDataHelper
{
float param0 = 0;
float param1 = 0;
bool param2 = false;
unsigned long param3 = 0;
unsigned long param4 = 0;
int param5 = 200;
};
ADS1115 m_ads;
float m_threshold;
bool m_calibrated;
int m_pin;
public:
// calibrates device and sets calibration flag to true if success
bool calibrate();
// initializes ADS and sets intial variables
void init();
// this function is being called continously in void loop() and some decisions are being maed based on it's return value
int has_data();
float get_thresh();
bool isCalibrated();
void resetCalibrationFlag();
sensor(JsonObject t_json_conf, ADS1115 t_ads);
};
#endif
And I want to make this config changeable by BLE callbacks and accessible in my entire program. I am thinking of having a Config class or a Singleton that will read my data from SPIFFS , parse them and initialize sensor instances.
So far I have 2 questions:
1. Are my thoughts on handling and storing config correct?
2. How should I keep changes in sync Between BLE callbacks , global config instance and config.json content
Thanks in advance!