Is there any possible to convert a string to a function that can be executed?

Projects Programming
1

Dear everyone,
I have a running project that to remotely monitor an equipment's currency and temperature.
Sometimes, I need to change the programs, I need to go to the machine take out the arduino and reflash it. I think if there is a way that can convert a string to be executed like a function. What I need to do is let arduino download this string on the internet and put this string to a function, then it like reprograms itself.
Anyway, is this possible?

2

Which board are you using ?

Using an ESP8266 board you can do updates Over The Air (OTA) with no physical connection to the board by using a wireless network

3

If I understand the question correctly, the short answer is "no". There is no way to convert a string to a function.

The question is what "change the programs" means. If it's just a few parameters that need adjustment, you can store those in eerpom.

If you have a set of pre-defined functions (and basically never want to add something new) that you want to execute, you can use something in the line of below.

void loop()
{
  char command[32];
  someFunctionToReceiveData(command);

  if(strcmp(command,"add") == 0)
  {
    add();
  }
  else if (strcmp(command,"subtract") == 0)
  {
    subtract();
  }
}

You probably need to store the receivedData in eeprom and retrieve from there to make it persistent.

void loop()
{
  char command[32];
  someFunctionToReceiveData(command);

  // if new comman d received
  if(strcmp(command,"")!=0)
  {
    // store in eeprom
  }
  // else execute last received command
  else
  {
    // read 'function' from eeprom and store in command
    ...
    ...
  }

  if(strcmp(command,"add") == 0)
  {
    add();
  }
  else if (strcmp(command,"subtract") == 0)
  {
    subtract();
  }
}