Wiznet makers

’m going to introduce how to connect W5100S-EVB-Pico to AWS IoT Core and transmit data to cloud.

For your reference, WIZnet has a separate docs website,

https://docs.wiznet.io/Product/iEthernet/W5100S/w5100s-evb-pico

First and foremost, you need an AWS account (sign up if you do not have one).

Once logged in, go to IoT Core Service and create a thing.

AWS IoT Core Home

 

Create a single thing

 

Enter thing name and DO NOT create shadow

 

Auto-generate new certificates

 

 

Attach a policy (you must create one if you haven’t created one). In my case, I allowed all for testing purposes; please create your policy corresponding to your needs. For more information about policies please refer to: https://docs.aws.amazon.com/iot/latest/developerguide/iot-policies.html

 

Download 4 certificates from the pop-up window. FYI, public key won’t be used. Please keep in mind that you won’t be able to download these keys later, so copy them to a safe place. Also, for security reasons it is recommended to delete these keys after adding them to the firmware.

One a ‘thing’ is created in AWS IoT Core, let’s move on to the next step – Firmware.

A sample firmware can be downloaded or cloned from the following Github link: https://github.com/Wiznet/RP2040-HAT-AWS-C

Please clone, update submodule and patch.

Copy the downloaded keys into..\.RP2040-HAT-AWS-C\examples\AWS_IoT_MQTT\mqtt_certificate.h.

RSA 2048bit key: Amazone Root CA 1 -> mqtt_root_ca

Device certificate -> mqtt_client_cert

Private keyfile -> mqtt_private_key

 

Next, it is necessary to input domain, publish & subscribe topic, Client ID. This information shall be added to define variables in..\RP2040-HAT-AWS-C\examples\AWS_IoT_MQTT\AWS_IoT_MQTT.c

Thing name shall be used as Client ID.

For testing purposes I used shadow/update, shadow/update/accepted as Topics.

 

You should be able to see the following log in the serial terminal.

Vice versa, you can also check the published data from the ‘MQTT test client to subscribed topic.