ArduinoLED Code
Demonstrating connection of smartphone to silple SSL server on Arduino
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| File | Date | Author | Commit |
|---|---|---|---|
| .idea | 2023-03-18 |
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[923f0e] Commit code for ArduinoLED |
| app | 2023-03-18 |
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[923f0e] Commit code for ArduinoLED |
| gradle | 2023-03-18 |
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[923f0e] Commit code for ArduinoLED |
| ssl_server | 2023-03-18 |
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[923f0e] Commit code for ArduinoLED |
| .gitignore | 2023-03-18 |
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[923f0e] Commit code for ArduinoLED |
| README.md | 2023-03-18 |
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[6b1f27] Test |
| build.gradle | 2023-03-18 |
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| gradle.properties | 2023-03-18 |
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| gradlew | 2023-03-18 |
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| gradlew.bat | 2023-03-18 |
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[923f0e] Commit code for ArduinoLED |
| settings.gradle | 2023-03-18 |
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| ssl.conf | 2023-03-18 |
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[923f0e] Commit code for ArduinoLED |
Read Me
Arduino LED
This project demonstrates how Arduino (WeMos D1 board) can be used from the smartphone application through HTTPS protocol. In this example we will generate the Certificate Authority and sign certificates. These certificates will be used to secure connection with Arduino.
- Create the ssl.conf file, which will contain the desired Common Name (CN) and SubjectAlternativeNames. See the example of tnis file in this repository.
- Generate authority key:
# First generate the certificate authority key.
openssl genrsa -out ca_key.pem 2048
# Generate the CA certificate.
openssl req -x509 -key rsa:4096 -key arduino_ca_key.pem -out arduino_ca_csr.pem -sha256 -days 100500
- Generate server key and certificate and sign it. Note, we have to set the CN and SubjectAlternativeNames to make sure, we are using the correct domain name.
# Generate server key
openssl genrsa -out server_key.pem 2048
# Create a signing request server_req.csr
openssl req -out server_req.csr -key server_key.pem -new -config ssl.conf
# Sign certificate with authority
openssl x509 -req -in server_req.csr -out server_cer.pem -sha256 -CAcreateserial -CA arduino_ca_csr.pem -CAkey arduino_ca_key.pem -days 100500 -extensions req_ext -extfile ssl.conf
- [Optional] Create the client key and certificate.
# Key
openssl genrsa -out client1_key.pem 2048
# Signing request
openssl req -out client1_req.csr -key client1_key.pem -new -config ssl.conf
# Generate certificate
openssl x509 -req -in client1_req.csr -out client1_cer.pem -sha256 -CAcreateserial -days 4000 -CA arduino_ca_csr.pem -CAkey arduino_ca_key.pem -extensions req_ext -extfile ssl.conf
- Place
arduino_ca_csr.pem,server_key.pemandserver_cer.pemto the Secrets folder on the SD card. - Create the
auth.jsonfile which will contain the authentication information as follows:
{
"ssid": "ssid_of_your_router",
"password": "password to router",
"arduino_ap_ssid": "desired_ssid_of_arduino_ap",
"arduino_ap_password": "password to arduino access point"
}
- Connect arduino to three color LED (KY-016) and SD card as described in
ssl_server.inoin thessl_serverfolder and launch the server. - Connect to arduino AP and test if you can access server using curl:
# Get the red, green and blue components of the RGB LED in JSON format
curl --cacert /home/User/workspace/IOT/keys/arduino_ca_csr.pem https://ARDUINO.IP.ADDRESS
# Light LED with red color
curl --cacert /home/User/workspace/IOT/keys/arduino_ca_csr.pem https://ARDUINO.IP.ADDRESS --data "red=100" --data "green=0" --data "blue=0"
- Place arduino CA certificate
arduino_ca_csr.pemtoapp/src/main/res/rawfolder and compile the android application. - Compile and run the application on Android smartphone.
