TCPClient

remoteIP()

Since 0.4.5:

Retrieves the remote IPAddress of a connected TCPClient. When the TCPClient is retrieved from TCPServer.available() (where the client is a remote client connecting to a local server) the IPAddress gives the remote address of the connecting client.

When TCPClient was created directly via TCPClient.connect(), then remoteIP returns the remote server the client is connected to.

// EXAMPLE - TCPClient from TCPServer

TCPServer server(80);
// ...

void setup()
{
    Serial.begin(9600);
    server.begin(80);
}

void loop()
{
    // check for a new client to our server
    TCPClient client = server.available();
    if (client.connected())
    {
        // we got a new client
        // find where the client's remote address
        IPAddress clientIP = client.remoteIP();
        // print the address to Serial
        Log.info("remoteAddr=%s", clientIP.toString().c_str());
    }
}

// EXAMPLE - TCPClient.connect()

TCPClient client;
client.connect("www.google.com", 80);
if (client.connected())
{
    IPAddress clientIP = client.remoteIP();
    // IPAddress equals whatever www.google.com resolves to
}