Find remote ip address TCP

This function is not built-in so you'll have to modify the library slightly. This is one way to do it, I think:

• Navigate to the class Adafruit_CC3000_ClientRef in the file Adafruit_CC3000_Server.h. In the class definition, just before the private methods and attributes are defined, you will add a new public attribute as follows:

  uint8_t ip_addr[4];  // assuming a typical IPv4 address
  

  It will hold the IP address of each ClientRef instance as the connection is accepted.

• Go to Adafruit_CC3000_Server::acceptNewConnections() near the end of Adafruit_CC3000_Server.cpp. A few lines will be added to get the IP address from the CC3000 and store it temporarily in the appropriate struct:

  static sockaddr tSocketClientAddr;  // file scope
  static socklen_t addr_len;
  
  // Accept new connections and update the connected clients.
  bool Adafruit_CC3000_Server::acceptNewConnections() {
    bool newClientCreated = false;
    // For any unconnected client, see if new connections are pending and accept
    // them as a new client.
    for (int i = 0; i < MAX_SERVER_CLIENTS; ++i) {
      if (!_clients[i].connected()) {
        // Note: Because the non-blocking option was set for the listening
        // socket this call will not block and instead return SOC_IN_PROGRESS (-2) 
        // if there are no pending client connections. Also, the address of the 
        // connected client is not needed, so those parameters are set to NULL.
        cc3k_int_poll();
        addr_len = sizeof(tSocketClientAddr);
        int soc = accept(_listenSocket, &tSocketClientAddr, &addr_len);
        if (soc > -1) {
          _clients[i] = Adafruit_CC3000_Client(soc);
          newClientCreated = true;
        }
        // else either there were no sockets to accept or an error occured.
      }
    }
    return newClientCreated;
  }
  

• You'll also edit the getClientRef() method in Adafruit_CC3000_Server.cpp:

  Adafruit_CC3000_ClientRef Adafruit_CC3000_Server::getClientRef(int8_t clientIndex) {
    if (clientIndex != -1) {
      Adafruit_CC3000_ClientRef newClient =  Adafruit_CC3000_ClientRef(&_clients[clientIndex]);
      // at least 2 (family) + 2 (port) + 4 (ip_addr) bytes expected
      // also check if address is standard ipv4
      if ((addr_len >= 8) && (tSocketClientAddr.sa_family == AF_INET)){
         // copy address into array; in network byte order  
         memcpy(newClient.ip_addr, &(tSocketClientAddr.sa_data[2]), 4);
      }
      return newClient;
    }
  
    // Couldn't find a client ready to read, so return a client that is not 
    // connected to signal no clients are available for reading (convention
    // used by the Ethernet library).
    return Adafruit_CC3000_ClientRef(NULL);
  }
  

  Save all the files.

• Now the address is stored in an array for each client and can be accessed from your sketch. For example, you can access the address in your sketch like this:

  In the loop() of the the HttpServer example:

   Adafruit_CC3000_ClientRef client = httpServer.available();
   if (client) {
     Serial.println(F("Client connected."));
     for (int i = 0; i < 3; i++){
       Serial.print(client.ip_addr[i]);
       Serial.print('.');
     }
     Serial.println(client.ip_addr[3]); 
     // other code
   }
  

Completely untested. Good luck.