socketio.begin on web address instead of ip number? connecting ESP32 to online server via socketio

[omarcostahamido]

I am trying to connect to a socketio server (version ^4.7.5) living on a cloud server i have, which has a domain on it.
But I've noticed that when I replace socketIO.begin("192.168.1.1", 3000, "/socket.io/?EIO=4"); with socketIO.begin("https://mydomain.com", 80, "/socket.io/?EIO=4"); it wont connect. I even tried it locally by spinning a local nodejs server and using socketIO.begin("http://192.168.1.3", 3000, "/socket.io/?EIO=4"); but it won't connect. I feel like I am missing something very basic here, so I appreciate your help very much! What would you do to connect an ESP32 using socketio to an external server on the web?
🙏

[omarcostahamido]

just to add a comment to say that i don't think socketio version would be the problem since it works when i connect with socketIO.begin("192.168.1.1", 3000, "/socket.io/?EIO=4"); to a machine running this latest version.

[Links2004]

the IP can be a domain/host to, you only do need to not add the protocol.

socketIO.begin("mydomain.com", 3000, "/socket.io/?EIO=4");

for SSL

socketIO.beginSSL("mydomain.com", 3000, "/socket.io/?EIO=4");

you can take a look here, for all the diffrent way of checking the cert (if needed).

arduinoWebSockets/src/SocketIOclient.h

Lines 53 to 62 in ca8026e

	#ifdef HAS_SSL
	void beginSSL(const char * host, uint16_t port, const char * url = "/socket.io/?EIO=3", const char * protocol = "arduino", uint32_t pingInterval = 60 * 1000, uint32_t pongTimeout = 90 * 1000, uint8_t disconnectTimeoutCount = 5);
	void beginSSL(String host, uint16_t port, String url = "/socket.io/?EIO=3", String protocol = "arduino", uint32_t pingInterval = 60 * 1000, uint32_t pongTimeout = 90 * 1000, uint8_t disconnectTimeoutCount = 5);
	#ifndef SSL_AXTLS
	void beginSSLWithCA(const char * host, uint16_t port, const char * url = "/socket.io/?EIO=3", const char * CA_cert = NULL, const char * protocol = "arduino", uint32_t pingInterval = 60 * 1000, uint32_t pongTimeout = 90 * 1000, uint8_t disconnectTimeoutCount = 5);
	void setSSLClientCertKey(const char * clientCert = NULL, const char * clientPrivateKey = NULL);
	#if defined(SSL_BARESSL)
	void beginSSLWithCA(const char * host, uint16_t port, const char * url = "/socket.io/?EIO=3", BearSSL::X509List * CA_cert = NULL, const char * protocol = "arduino", uint32_t pingInterval = 60 * 1000, uint32_t pongTimeout = 90 * 1000, uint8_t disconnectTimeoutCount = 5);
	void setSSLClientCertKey(BearSSL::X509List * clientCert = NULL, BearSSL::PrivateKey * clientPrivateKey = NULL);
	#endif

[omarcostahamido]

I was about to write here that I am at a lost. but then it hit me...
socketIO.beginSSL("mydomain.com", 443, "/socket.io/?EIO=4");
of course, https is served on port 443! dOH!
Thank you so much for your patience... it works beautifully.
Sometimes all you need is to take it reeally slow :)