this gist shows how to communicate a http server via arduino uno + rsp 8299

arduino-httpclient

// NOTE: the following is just a POC. codes are not purified yet.

#include <SoftwareSerial.h>
SoftwareSerial esp8266 = SoftwareSerial(3,2); // another serial which binds pix TX:3, RX:2 for comminucating ESP8266
// NOTE: the default serial is used to send debug info back to PC.

// the wifi configuration
const char wifiName[50] = "bad1", wifiPassword[50] = "illbeback";

void setup() {
  // put your setup code here, to run once:
  Serial.begin(9600); // setup baao rate: 9600 from pc to arduino
  esp8266.begin(9600); // setup bauo rate: 9600 from arduino to BSP8299

  digitalWrite(13, HIGH);

  resetWifi();
  waitResponse();

  useMultiConn();
  waitResponse();

  changeToStationMode();
  waitResponse();

  connectToWiFi();
  waitResponse();

  digitalWrite(13, LOW);
}

void loop() {
  // put your main code here, to run repeatedly:

  connectToOtherDevice("192.168.43.193", 8099, "");
}

void noWaitResponse() {
  delay(3000);
  while (esp8266.available() <= 0) {
  }

  while (esp8266.available() > 0) {
    //drawn all bytes
    Serial.print(esp8266.read(), DEC);
    Serial.print(" ");
  }
  Serial.println();
}

void waitResponse() {
  delay(3000);
  while (esp8266.available() <= 0) {
  }

  while (esp8266.available() > 0) {
    //drawn all bytes
    Serial.print(esp8266.read(), DEC);
    Serial.print(" ");
  }
  Serial.println();
}

void resetWifi() {
  esp8266.println("AT+RST");
  while (esp8266.available() <= 0) {
  }
  delay(1000);
}

void useMultiConn() {
  esp8266.println("AT+CIPMUX=1"); //enable multiple connections
}

void changeToStationMode() {
  esp8266.println("AT+CWMODE=1");
  while (esp8266.available() <= 0) {
  }
  delay(700);
}

void connectToWiFi() {
  esp8266.print("AT+CWJAP=\"");
  esp8266.print(wifiName);
  esp8266.print("\",\"");
  esp8266.print(wifiPassword);
  esp8266.println("\"");
  delay(10000); // wait for a long delay.
}

void connectToOtherDevice(const char* ip, int port, const char * commands) {
  char port_str[4];
  char datalen_str[4];
  char cmdBuffer[128];
  unsigned long ip_long;

  memset(cmdBuffer, 0, 128);
  memset(port_str, 0, 4);
  memset(datalen_str, 0, 4);

  // convert port
  itoa(port, port_str, 10);


  int datalen = 0;
  // "GET " "/" "\r\n" 
  datalen += (4 + 1 + 2);
  // " HTTP/1.0\r\nHosts: " + "192.168.43.193:8099 + "\r\n\r\n\r\n"
  datalen += 17 + 19 + 6;
  
  itoa(datalen, datalen_str, 10);

  // send command
  // AT+CIPSTART=1,"TCP","192.168.43.193",8099, where 1 indicates multiconnection.
  // 192.168.43.193 is the server's ip, and 8099 is the service port
  strcpy(cmdBuffer, "AT+CIPSTART=1,\"TCP\",\"");
  sprintf(&cmdBuffer[strlen(cmdBuffer)], ip);
  strcpy(&cmdBuffer[strlen(cmdBuffer)], "\",");
  strcpy(&cmdBuffer[strlen(cmdBuffer)],port_str);

  // send command
  Serial.println(cmdBuffer);
  esp8266.println(cmdBuffer);

  waitResponse();

  memset(cmdBuffer, 0, 128);
  // sned comamnd
  // AT+CIPSEND=1,$byte, where $byte is the total bytes send
  strcpy(cmdBuffer, "AT+CIPSEND=1,");
  strcpy(&cmdBuffer[strlen(cmdBuffer)], datalen_str);

  // send
  esp8266.println(cmdBuffer);
  Serial.println(cmdBuffer);
  
  waitResponse();

  memset(cmdBuffer, 0, 128);
  // send command
  // GET / HTTP/1.0\r\nHost: 192.168.43.193:8099\r\n\r\n\r\n

  Serial.println(strlen(cmdBuffer));
  strcpy(&cmdBuffer[strlen(cmdBuffer)], "GET / HTTP/1.0\r\n");
  strcpy(&cmdBuffer[strlen(cmdBuffer)], "Host: 192.168.43.193:8099\r\n\r\n\r\n");

  // send
  esp8266.println(cmdBuffer);
  Serial.println(cmdBuffer);

  if (esp8266.available() > 0) {
    if (esp8266.find("+IPD,")) {
      noWaitResponse();
    }
  }

  esp8266.println("AT+CIPCLOSE=1");
}