TCP

Service

tcp_listener_tls.bal

import ballerina/io;
import ballerina/tcp;

listener tcp:Listener securedEP = check new (3000,
    secureSocket = {
        key: {
            certFile: "./resources/public.crt",
            keyFile: "./resources/private.key"
        }
    }
);

isolated service on securedEP {
    isolated remote function onConnect(tcp:Caller caller) returns tcp:ConnectionService {
        io:println("Client connected on server port: ", caller.remotePort);
        return new EchoService();
    }
}

isolated service class EchoService {

    *tcp:ConnectionService;

    isolated remote function onBytes(readonly & byte[] data) returns byte[] {
        io:println("Received message: ", string:fromBytes(data));
        return data;
    }
}

$ bal run tcp_listener_tls.bal

Client

tcp_client_tls.bal

import ballerina/io;
import ballerina/tcp;

final tcp:Client securedEP = check new ("localhost", 3000,
    secureSocket = {
        cert: "./resources/public.crt"
    }
);

public function main() returns error? {
    check securedEP->writeBytes("Hello, World!".toBytes());
    readonly & byte[] receivedData = check securedEP->readBytes();
    io:println("Received message: ", string:fromBytes(receivedData));
    check securedEP->close();
}

$ bal run tcp_client_tls.bal

Resources

public.crt

-----BEGIN CERTIFICATE-----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-----END CERTIFICATE-----

private.key

-----BEGIN PRIVATE KEY-----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-----END PRIVATE KEY-----