Dear Arduino community,
I require to make an HTTPS POST call to Amazon AWS api gateway using Arduino Uno R4 WiFi.
My code is this:
#define SECRET_SSID "xxxxx"
#define SECRET_PASS "xxxxxx"
#include "WiFiS3.h"
#include <ArduinoHttpClient.h>
// credentials
const char* ssid = SECRET_SSID;
const char* pass = SECRET_PASS;
// endpoint
const char* airQualityApi = "xxxxxxxx.execute-api.ca-central-1.amazonaws.com";
int port = 443;
WiFiSSLClient client;
const char* root_ca = \
"-----BEGIN CERTIFICATE-----\n" \
"MIIF+jCCBOKgAwIBAgIQDx2LdHYjwUKACiThmfYnYzANBgkqhkiG9w0BAQsFADA8\n" \
"MQswCQYDVQQGEwJVUzEPMA0GA1UEChMGQW1hem9uMRwwGgYDVQQDExNBbWF6b24g\n" \
"UlNBIDIwNDggTTAzMB4XDTI0MDUwMjAwMDAwMFoXDTI1MDUzMTIzNTk1OVowMzEx\n" \
"MC8GA1UEAwwoKi5leGVjdXRlLWFwaS5jYS1jZW50cmFsLTEuYW1hem9uYXdzLmNv\n" \
"bTCCASIwDQYJKoZIhvcNAQEBBQADggEPADCCAQoCggEBAMvDfJzSmdOtLrssK3e6\n" \
"u9cLM8HIe033DCaWhwh4b9PQk6U8lPdBpdhcYawaK2VBL0j7xkgsIBlAhPOEpYcL\n" \
"Zjc78U7qwz52uWf1T3evtJnSzy9lMlw8MNPBEuglIb0+p19gWb5lrvLqmRlQQCCA\n" \
"h6lR9Bu4pjnCoM+ddQ7yrpU9KdHMOtIFr7GVij08ZdGbCA60T4OOoRCrSLlektaU\n" \
"GrRaRFRNa36ttPGR6wG7LYl9mIxaMFZXzKASPII+G0lAs4IgYvzBGwgipi6t21oi\n" \
"199Hg2p5+KF6GqMo3/bgdAFEa3qpEYLDKfdtR7V/+O2xzO8pggQyrF3tLR7nO8NV\n" \
"wg0CAwEAAaOCAv8wggL7MB8GA1UdIwQYMBaAFFXZGF/SHMwB4Vi0vqvZVUIB1y4C\n" \
"MB0GA1UdDgQWBBSrtytghbX44SulKDRDLZ0i/WELNzAzBgNVHREELDAqgigqLmV4\n" \
"ZWN1dGUtYXBpLmNhLWNlbnRyYWwtMS5hbWF6b25hd3MuY29tMBMGA1UdIAQMMAow\n" \
"CAYGZ4EMAQIBMA4GA1UdDwEB/wQEAwIFoDAdBgNVHSUEFjAUBggrBgEFBQcDAQYI\n" \
"KwYBBQUHAwIwOwYDVR0fBDQwMjAwoC6gLIYqaHR0cDovL2NybC5yMm0wMy5hbWF6\n" \
"b250cnVzdC5jb20vcjJtMDMuY3JsMHUGCCsGAQUFBwEBBGkwZzAtBggrBgEFBQcw\n" \
"AYYhaHR0cDovL29jc3AucjJtMDMuYW1hem9udHJ1c3QuY29tMDYGCCsGAQUFBzAC\n" \
"hipodHRwOi8vY3J0LnIybTAzLmFtYXpvbnRydXN0LmNvbS9yMm0wMy5jZXIwDAYD\n" \
"VR0TAQH/BAIwADCCAXwGCisGAQQB1nkCBAIEggFsBIIBaAFmAHUATnWjJ1yaEMM4\n" \
"W2zU3z9S6x3w4I4bjWnAsfpksWKaOd8AAAGPNqQ21wAABAMARjBEAiAu9BohKmLQ\n" \
"uS9lIf61W8mfDg6LzawjeZNEroZbUQTD/QIgbZH74UzyqwI5C5JjG91A2pHuAcnX\n" \
"omDi8C0eT77zdBgAdgB9WR4S4XgqexxhZ3xe/fjQh1wUoE6VnrkDL9kOjC55uAAA\n" \
"AY82pDb7AAAEAwBHMEUCIQDjjqm95PqYCX4svyd0e7eXsDqDdhDhJmKrBIUt7RVw\n" \
"lAIgHFSyL/R0pV27dVocf/+HWLgd5rl1chtNhofBR7HLH28AdQDm0jFjQHeMwRBB\n" \
"Btdxuc7B0ksdczxczdczMh39HjeOUAAAAY82pDcNAAAEAwBGMEQCID7MWq15los6\n" \
"wkkAKdqE0CwgLEtTmeqFK6zfWpAO2xOgAiAqDzx4OZi3pmNmr+4jwaJCjv2L6+3i\n" \
"2G0bwpddtWXzqzANBgkqhkiG9w0BAQsFAAOCAQEAjzY2uugyGnEGr+Xlg60Uxb6U\n" \
"NtvE+VyU6aF4dA2rwXXsHvc+vjJ0/YJ7oNOBSHWijnbi9IoNhSeintLYslujMGGB\n" \
"gPDfmVFDoTD5rX39uo1AiFBH2XvnlO3P2BMNxbFfKYyAlANRvdRyitJTF0VdFrqS\n" \
"/knv52gFaTrPCELSL9NFGIgTgfxlo2p+P1w0mooQqQt1o9njv56MdoGuoE9jSq57\n" \
"uqNbPlMX9zgJtAM3U+GlN1/RD7uncM1tWgkX6U8Xr5n0pI4zWGRkkJWt4O/5kSc5\n" \
"b+UT9lWp9/CW5KaMCOn48O40FZY+x/DqKRsRtiWiFgW4mtohzlsANO53VrOCdQ==\n" \
"-----END CERTIFICATE-----\n";
void setup() {
Serial.begin(9600);
while (!Serial) {
;
}
// Connect to WiFi
WiFi.begin(ssid, pass);
Serial.print("Connecting to WiFi");
while (WiFi.status() != WL_CONNECTED) {
delay(1000);
Serial.print(".");
}
Serial.println();
Serial.println("WiFi connected");
Serial.println("IP address: ");
Serial.println(WiFi.localIP());
// root certificate
client.setCACert(root_ca);
// fixed value data to API
sendData(airQualityApi, "/co2INSERT_stage/co2INSERT_REST", "airQuality", 123.45);
}
void loop() {
// Intentional
}
void sendData(const char* server, const char* resourcePath, const char* sensorType, float value) {
Serial.print("Connecting to server: ");
Serial.println(server);
// connect to the server
if (!client.connect(server, port)) {
Serial.println("Connection failed!");
return;
}
// JSON payload with fixed value
String jsonData = "{\"sensorValue\":" + String(value, 2) + "}";
Serial.print("Sending JSON data: ");
Serial.println(jsonData);
client.print(String("POST ") + resourcePath + " HTTP/1.1\r\n" +
"Host: " + server + "\r\n" +
"User-Agent: Arduino/1.0\r\n" +
"Content-Type: application/json\r\n" +
"Content-Length: " + String(jsonData.length()) + "\r\n" +
"Connection: close\r\n\r\n" +
jsonData);
int timeout = millis() + 5000;
while (client.available() == 0) {
if (timeout - millis() < 0) {
Serial.println(">>> Client Timeout !");
client.stop();
return;
}
}
while (client.available()) {
String line = client.readStringUntil('\r');
Serial.print(line);
}
client.stop();
}
I can confirm that my Arduino gets connected to WiFi (have checked with Google to get its Html, which works).
I can also confirm that the API endpoint is accessible, tried it with Postman and works flawlessly.
However using the Arduino it does not work.
Could you please guide me in this?
I have obfuscated the root cert and removed the WiFi info for confidentiality reasons.
Many thanks in advance.
Kind Regards,
Shizar
