I2C sending data from arduino to python gives gibberish data

[sdandys]

It's my first time working with SMBUS and I've read the docs of arduino and the Wire object. It states that I can send a string. To quote the docs: string: a string to send as a series of bytes. write() - Arduino Reference

When I convert my int to a String type and pass it along to Wire.write, I can't read it with Python.

Slave address: `0x8`

    void setup() {
      Serial.begin(BaudRate); delay(10);
      Wire.begin(SLAVE_ADDRESS); 0x8
      Wire.onRequest(sendData); 
    }
    
    void loop() {
       sendData(1272); // right now hard-coded for testing purposes
    }
    // callback for sending data
    void sendData(int data) {
        String dataString = String(data);
        int len = dataString.length() + 1;
        char charDataString[len];
        dataString.toCharArray(charDataString, len);
        for (int i = 0; i < len; i++) {
            Serial.println(charDataString[i]); -> SHOWS THE CORRECT VALUES
            Wire.write(charDataString[i]);
        }
        delay(1000);
    }

My python code (how I read the data):

    import smbus
    import time
    bus = smbus.SMBus(1)
    address = 0x8
    while True:
        data = ""
        for (i in range(0, 10))
            ##BOTH VARIANTS DO NOT WORK
            data = bus.read_i2c_block_data(address, 99, 3)
            data += chr(bus.read_byte(address));

        print(data)
        time.sleep(1)

I can't wrap my head around what I am doing wrong here. If there is a way to immediately send it over instead of each value individually I'd prefer that as well.

[jremington]

@sdandys

When I convert my int to a String type

That seems like a silly thing to do. There is never a need for Strings with Arduino, especially when you turn right around and convert the String to a character data array.
dataString.toCharArray(charDataString, len);

To convert integers to C-strings (zero terminated character arrays), use the function itoa() and its relatives.

On the AVR-based Arduinos, use of Strings often causes program crashes or malfunction.

What computer is running python, and how is that an Arduino problem?

[sdandys]

The pi is running python and my problem is that I cannot convert the values I send back to the correect values.