I assume that I a am not the first one to ask, but how can I select other fonts? Thanks

Wow, this should have been simple but apparently I am overseeing something.
I have a M5Stack Core 2 connected to M5AtomMatrix using the Port A on Core 2 and HY2.0-4P port on the Matrix. Included the code of sender and receiver. But I dont see any transmission going on. Which obvious mistake am I making here?
M5Stack Core 2 code :

#include <M5Core2.h>
#include <Wire.h>
#define I2C_DEV_ADDR 0x55
uint32_t i = 0;

void setup() {

M5.begin(true, true, true, true);
delay(300);

Serial.setDebugOutput(true);
Wire.begin(32,33);  // SDA SCL M5Stack Core 2

}

void loop() {
delay(5000);

//Write message to the slave
Wire.beginTransmission(I2C_DEV_ADDR);
Wire.printf("Hello World! %u", i++);
uint8_t error = Wire.endTransmission(true);
Serial.printf("endTransmission: %u\n", error);

//Read 16 bytes from the slave
error = Wire.requestFrom(I2C_DEV_ADDR, 16);
Serial.printf("requestFrom: %u\n", error);
if(error){
uint8_t temp[error];
Wire.readBytes(temp, error);
log_print_buf(temp, error);
}

}

M5Atom Matrix code here:

//#include "M5Atom.h"
#include "M5StickC.h"
#include <Wire.h>
#define I2C_DEV_ADDR 0x55

uint32_t i = 0;

void onRequest(){
Wire.print(i++);
Wire.print(" Packets.");
Serial.println("onRequest");
}

void onReceive(int len){
Serial.printf("onReceive[%d]: ", len);
while(Wire.available()){
Serial.write(Wire.read());
}
Serial.println();
}

void setup() {

M5.begin(true,true,true);
delay(300);

Serial.begin(115200);
Serial.setDebugOutput(true);
Wire.onReceive(onReceive);
Wire.onRequest(onRequest);
Wire.begin(26,32); // SDA SCL M5Atom

}

void loop() {

}

I had really hope that someone could shed a light on this issue? Being a great product as it already is, its usability could be even more increased if some documentation about the binary format for the sound data is published.
Really no one?
Regards

I have been googling around, no understandable answers found. But I am sure I am not the only one with this interest.
Could anyone explain the binary format of the sound stream used in the echo? And also nice to have : howto proces a mp3 or wav file into the required binary array to be used in the Echo?
Thanks.

Uh, what type of paper do I need to purchase for this printer? Is it somehow a standard package? Thank you.

@ajb2k3 Thank you. After fully erasing the firmware I have executed again all the steps in the AWS getting started section. Again, same error about connection issue. The steps about Private key, Public key and region are not mentioned in the manual for Cloud connected Blinky.
I should point out to that I was able te recreate the getting started example and are able to connect my rainmaker app on my iPhone with the AWS module. So that is at least a small step. I hope anyone can chip in.

Dear all.
I believe I have follow all the steps as described in : https://edukit.workshop.aws/en/blinky-hello-world/blinking-the-leds.html Unfortunately the blink app is not able to connect to the AWS IoT Core. Please check the table of all the steps I have done. Have I missed something? Did I make a mistake somewhere? Help is appreciated. Regards
Getting started https://edukit.workshop.aws/en/getting-started.html
M5Stack Core 2 AWS https://shop.m5stack.com/collections/stack-series/products/m5stack-core2-esp32-iot-development-kit-for-aws-iot-edukit Check
Mac OS X Visual studio code https://visualstudio.microsoft.com Check
ESP Rainmaker for IOS https://apps.apple.com/us/app/esp-rainmaker/id1497491540 Check
Silicon Labs USB to UART bridge setup Check
Cloning the code repository https://github.com/m5stack/Core2-for-AWS-IoT-EduKit.git Check
Building and uploading the RainMaker Agent firmware pio run --environment core2foraws
Check Check
Compile firmware pio run --environment core2foraws --target upload
Check
Monitor serial port pio run --environment core2foraws --target monitor
Check
Claiming and provisioning the device QR code received, scanned in with rainmaker app Check
Have an AWS account that is not running production workloads Check
Downloading and Installing the AWS CLI Check
Configuring the AWS CLI Was configure run. IAM user credentials stored. Not sure about region, choose us-west-2 although I am in Europe. Does that matter? Check
Check CLI aws --version Check
Next, you will verify the AWS CLI is configured with your IAM credentials and US West (Oregon) region aws iot describe-endpoint --endpoint-type iot:Data-ATS
Check
Opening the Blink Hello World project Check
Retrieving the Device Certificate and Registering your AWS IoT thing cd utilities/AWS_IoT_registration_helper python3 registration_helper.py -p 2 Check (Port 2 is used)
go back to the Blinky-Hello-World directory cd ../..
Check
Before you set the configuration, you will first need to retrieve your AWS IoT endpoint. aws iot describe-endpoint --endpoint-type iot:Data-ATS
Check
Now, you’ll go into the KConfig menu to configure the required symbols, including Wi-Fi and AWS IoT endpoint address. Start by switching to the Blink-Hello-World directory of the repository in the PIO terminal window and enter pio run --environment core2foraws --target menuconfig

Component config –> Amazon Web Services IoT Platform and open AWS IoT Endpoint Hostname to set the string

Then select AWS IoT EduKit Configuration from the menu. Set your WiFi SSID and WiFi Password with your Wi-FI credentials Check
To build the firmware, paste in the command below (it will take several minutes): pio run --environment core2foraws
Check
With the build successful, it’s time to upload the compiled firmware to the connected device over USB by running the command pio run --environment core2foraws --target upload
Check
Lastly, monitor the serial output from the device on your host machine via: pio run --environment core2foraws --target monitor
Check
And this is where the monitor show this error ␛[0;31mE (133448) MAIN: Error(-12) connecting to XXXXXXXXXXXXXXX-ats.iot.us-west-2.amazonaws.com:8883␛[0m
␛[0;32mI (134508) aws_iot: Attempting to use device certificate from ATECC608␛[0m
␛[0;31mE (137328) aws_iot: Failed
! mbedtls_ssl_read returned -0x7880 No connection.
Display shows WiFi symbol
And
Starting Cloud Connected Blinky
Connecting to AWS IoT Core..

@felmue Yes thank you. I never realised that in one of my folder names I had used a white space (maybe I really need reading glasses). Now I am struggling to get my AWS blink setup and running. Will come back later with a detailed description of my challenge ;-)

So my first steps in setting up a project with M5Stack AWS on my Mac OSX Big Sur (11.6). Installation of visual studio seems okay. When compiling the AWS IoT EduKit Getting Started PlatformIO Configuration File I get this error message :
Error: Detected a whitespace character in project paths.
Been already googling around. Not sure about the solution. I have read that I need to change the director path in a ini file. But then I am lost. Any help? Thanks

@felmue Thank you for your response. I also came to the conclusion that this device is not suitable for LoRa PoP applications. That is really a pity. This one is suitable for LoRa PoP (I got that one working) : M5 LORA-MODULE-868MHZ. https://shop.m5stack.com/products/lora-module-868mhz?_pos=2&_sid=e21d4a90e&_ss=r