Hello everybody,
I am using an Arduino Nano 33 IoT and am trying to connect to my Raspberrypi 4 using a self signed SSL certificate. However, it does not work and after googling hours over hours, I tought to ask the Arduino Community.
On my raspberrypi I've set up an Nginx-Server that is using the desired client-certificate. Next I uploaded the certificate following these instructions: https://support.arduino.cc/hc/en-us/articles/360016119219-How-to-add-certificates-to-Wifi-Nina-Wifi-101-Modules-
I got a message from the FirmwareUpdater, that all certificates were successfully uploaded.
As for the next step, I took the WiFiSSLClient sample code and adjusted the code to my needs.
/*
This example creates a client object that connects and transfers
data using always SSL.
It is compatible with the methods normally related to plain
connections, like client.connect(host, port).
Written by Arturo Guadalupi
last revision November 2015
*/
#include <SPI.h>
#include <WiFiNINA.h>
#include "arduino_secrets.h"
///////please enter your sensitive data in the Secret tab/arduino_secrets.h
char ssid[] = SECRET_SSID; // your network SSID (name)
char pass[] = SECRET_PASS; // your network password (use for WPA, or use as key for WEP)
int keyIndex = 0; // your network key index number (needed only for WEP)
int status = WL_IDLE_STATUS;
// if you don't want to use DNS (and reduce your sketch size)
// use the numeric IP instead of the name for the server:
char server[] = "raspberrypi";
// Initialize the Ethernet client library
// with the IP address and port of the server
// that you want to connect to (port 80 is default for HTTP):
WiFiSSLClient client;
void setup() {
//Initialize serial and wait for port to open:
Serial.begin(9600);
while (!Serial) {
; // wait for serial port to connect. Needed for native USB port only
}
// check for the WiFi module:
if (WiFi.status() == WL_NO_MODULE) {
Serial.println("Communication with WiFi module failed!");
// don't continue
while (true);
}
String fv = WiFi.firmwareVersion();
if (fv < WIFI_FIRMWARE_LATEST_VERSION) {
Serial.println("Please upgrade the firmware");
}
// attempt to connect to WiFi network:
while (status != WL_CONNECTED) {
Serial.print("Attempting to connect to SSID: ");
Serial.println(ssid);
// Connect to WPA/WPA2 network. Change this line if using open or WEP network:
status = WiFi.begin(ssid, pass);
// wait 10 seconds for connection:
delay(10000);
}
Serial.println("Connected to WiFi");
printWiFiStatus();
Serial.println("\nStarting connection to server...");
// if you get a connection, report back via serial:
if (client.connect(server, 443)) {
Serial.println("connected to server");
// Make a HTTP request:
client.println("Host: raspberrypi");
client.println("Connection: close");
client.println();
}
}
void loop() {
// if there are incoming bytes available
// from the server, read them and print them:
while (client.available()) {
char c = client.read();
Serial.write(c);
}
// if the server's disconnected, stop the client:
if (!client.connected()) {
Serial.println();
Serial.println("disconnecting from server.");
client.stop();
// do nothing forevermore:
while (true);
}
}
void printWiFiStatus() {
// print the SSID of the network you're attached to:
Serial.print("SSID: ");
Serial.println(WiFi.SSID());
// print your board's IP address:
IPAddress ip = WiFi.localIP();
Serial.print("IP Address: ");
Serial.println(ip);
// print the received signal strength:
long rssi = WiFi.RSSI();
Serial.print("signal strength (RSSI):");
Serial.print(rssi);
Serial.println(" dBm");
}
I get the following output:
As you can see, I am able to connect to my WiFi, but not to my raspberrypi. However, I can connect to my raspberrypi over https using the browser of my PC (after installing the self signed certificates manually in my browser, of course).
Also, I already tried connecting to the raspberrypi from the arduino without SSL and that worked just fine.
Does anyone have a clue why I can't connect to my raspberrypi over SSL using the arduino?
Thanks in advance!
