Update sessions example to show speed difference (#8528)

Fixes #8505

libraries/ESP8266WiFi/examples/BearSSL_Sessions/BearSSL_Sessions.ino

@@ -1,5 +1,12 @@
 // Example of using SSL sessions to speed up SSL connection initiation
 //
+// Note that sessions are a function of individual HTTPS servers, so if you
+// are connecting to a service through a load abalncer (i.e. Azure, AWS, GitHub)
+// two connections to the same IP address will generally connect to two
+// different web servers, meaning that sessions won't work.  If you are
+// connecting to a single server not behind a load balancer/etc., however,
+// there should be a significant speedup.
+//
 // September 2018 by Earle F. Philhower, III
 // Released to the public domain
 
@@ -94,12 +101,14 @@ void fetchURL(BearSSL::WiFiClientSecure *client, const char *host, const uint16_
 void loop() {
   uint32_t start, finish;
   BearSSL::WiFiClientSecure client;
-  BearSSL::X509List cert(cert_DigiCert_High_Assurance_EV_Root_CA);
+  BearSSL::X509List cert(certForum);
+  const char *host = "esp8266.com";
+  const int port = 443;
 
   Serial.printf("Connecting without sessions...");
   start = millis();
   client.setTrustAnchors(&cert);
-  fetchURL(&client, github_host, github_port, path);
+  fetchURL(&client, host, port, path);
   finish = millis();
   Serial.printf("Total time: %dms\n", finish - start);
 
@@ -108,21 +117,21 @@ void loop() {
   Serial.printf("Connecting with an uninitialized session...");
   start = millis();
   client.setTrustAnchors(&cert);
-  fetchURL(&client, github_host, github_port, path);
+  fetchURL(&client, host, port, path);
   finish = millis();
   Serial.printf("Total time: %dms\n", finish - start);
 
   Serial.printf("Connecting with the just initialized session...");
   start = millis();
   client.setTrustAnchors(&cert);
-  fetchURL(&client, github_host, github_port, path);
+  fetchURL(&client, host, port, path);
   finish = millis();
   Serial.printf("Total time: %dms\n", finish - start);
 
   Serial.printf("Connecting again with the initialized session...");
   start = millis();
   client.setTrustAnchors(&cert);
-  fetchURL(&client, github_host, github_port, path);
+  fetchURL(&client, host, port, path);
   finish = millis();
   Serial.printf("Total time: %dms\n", finish - start);
 

libraries/ESP8266WiFi/examples/BearSSL_Sessions/certUpdate

@@ -1,2 +0,0 @@
-cd ${0%/*} 2>/dev/null
-python3 ../../../../tools/cert.py -s api.github.com -n github > certs.h

libraries/ESP8266WiFi/examples/BearSSL_Sessions/certs.h

@@ -1,90 +1,34 @@
-
+const char certForum [] PROGMEM = R"EOF(
-// this file is autogenerated - any modification will be overwritten
-// unused symbols will not be linked in the final binary
-// generated on 2021-07-26 22:04:48
-// by ['../../../../tools/cert.py', '-s', 'api.github.com', '-n', 'github']
-
-#pragma once
-
-////////////////////////////////////////////////////////////
-// certificate chain for api.github.com:443
-
-const char* github_host = "api.github.com";
-const uint16_t github_port = 443;
-
-// CN: *.github.com => name: __github_com
-// not valid before: 2021-03-25 00:00:00
-// not valid after:  2022-03-30 23:59:59
-const char fingerprint___github_com [] PROGMEM = "96:84:07:df:0b:1c:f6:58:14:df:d7:33:35:57:51:9b:15:4d:8c:e7";
-const char pubkey___github_com [] PROGMEM = R"PUBKEY(
------BEGIN PUBLIC KEY-----
-MFkwEwYHKoZIzj0CAQYIKoZIzj0DAQcDQgAElL9/+0TidTIALPfU/tiS6pI8zAIk
-rU4pohUldVc0bb6O3FARl3cnqIDK9SoF65z3xiR6XsnFS8F0Oy/chXR/kQ==
------END PUBLIC KEY-----
-)PUBKEY";
-
-// http://cacerts.digicert.com/DigiCertHighAssuranceTLSHybridECCSHA2562020CA1.crt
-// CN: DigiCert High Assurance TLS Hybrid ECC SHA256 2020 CA1 => name: DigiCert_High_Assurance_TLS_Hybrid_ECC_SHA256_2020_CA1
-// not valid before: 2020-12-17 00:00:00
-// not valid after:  2030-12-16 23:59:59
-const char cert_DigiCert_High_Assurance_TLS_Hybrid_ECC_SHA256_2020_CA1 [] PROGMEM = R"CERT(
 -----BEGIN CERTIFICATE-----
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 -----END CERTIFICATE-----
-)CERT";
+)EOF";
-
-// http://cacerts.digicert.com/DigiCertHighAssuranceEVRootCA.crt
-// CN: DigiCert High Assurance EV Root CA => name: DigiCert_High_Assurance_EV_Root_CA
-// not valid before: 2006-11-10 00:00:00
-// not valid after:  2031-11-10 00:00:00
-const char cert_DigiCert_High_Assurance_EV_Root_CA [] PROGMEM = R"CERT(
------BEGIN CERTIFICATE-----
-MIIDxTCCAq2gAwIBAgIQAqxcJmoLQJuPC3nyrkYldzANBgkqhkiG9w0BAQUFADBs
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------END CERTIFICATE-----
-)CERT";
-
-
-// end of certificate chain for api.github.com:443
-////////////////////////////////////////////////////////////