New TLS implementation

Implement TLS to mqtt server thanks to WiFiClientSecure class

Author: Tico06

examples/GatewayESP8266SecureMQTTClient/certs.h

@@ -0,0 +1,133 @@
+#pragma once
+
+// The mqqt host and port
+const char* mqtt_host = "<mqtt_host>";
+const uint16_t mqtt_port = <mqtt_port>;
+
+//The finger print to validate the mqtt server certificate. This is less secure and less convenient
+// than using certificate authorities
+// Command (3 lines...) to obtain the certificate finger print:
+// $>openssl s_client -connect <hostname>:<host port> < /dev/null 2>/dev/null | \
+//           openssl x509 -fingerprint -noout -in /dev/stdin \
+//           awk -F= '{print $2}'
+const char mqtt_fingerprint [] PROGMEM = "CA:EE:2B:ED:D3:23:A7:F1:8C:73:9E:9B:B7:D5:75:41:10:61:E4:05";
+
+//Certificate Authorities. The best method to validate server certificates
+// Advised to retrieve root Certificate Authorities as they expire less often
+// than server certificates. Here after letsencrypt Certificate Authorities are listed.
+// They are available at https://letsencrypt.org/certificates/
+
+// Root Certificate Authorities ISRG Root X1
+// https://letsencrypt.org/certs/isrgrootx1.pem
+// Not Before: Jun  4 11:04:38 2015 GMT
+// Not After : Jun  4 11:04:38 2035 GMT
+const char cert_isrgrootx1_Authority [] PROGMEM = R"CERT(
+-----BEGIN CERTIFICATE-----
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+-----END CERTIFICATE-----
+)CERT";
+
+// Root Certificate Authorities ISRG Root X2
+// https://letsencrypt.org/certs/isrg-root-x2.pem
+// Not Before: Sep  4 00:00:00 2020 GMT
+// Not After : Sep 17 16:00:00 2040 GMT
+const char cert_isrgrootx2_Authority [] PROGMEM = R"CERT(
+-----BEGIN CERTIFICATE-----
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+-----END CERTIFICATE-----
+)CERT";
+
+// This one shouldn't be needed....
+// Root Certificate Authorities Let’s Encrypt R3
+// https://letsencrypt.org/certs/lets-encrypt-r3.pem
+// Not Before: Sep  4 00:00:00 2020 GMT
+// Not After : Sep 15 16:00:00 2025 GMT
+const char cert_letsEncryptR3_Authority [] PROGMEM = R"CERT(
+-----BEGIN CERTIFICATE-----
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+-----END CERTIFICATE-----
+)CERT";
+
+//The mqtt server may require client certificate for authentication.
+// The following are genereted and signed thanks to openssl.
+// The signing certificate is holded by the mqtt server.
+// Please see Client section in https://mosquitto.org/man/mosquitto-tls-7.html
+const char cert_client [] PROGMEM = R"CERT(
+-----BEGIN CERTIFICATE-----
+... ... ... ... ...
+-----END CERTIFICATE-----
+)CERT";
+
+const char key_client [] PROGMEM = R"CERT(
+-----BEGIN RSA PRIVATE KEY-----
+... ... ... ... ...
+-----END RSA PRIVATE KEY-----
+)CERT";
+// end of certificate chain
+////////////////////////////////////////////////////////////