Error receiving a message from the server

I am testing the SerialESP8266_library_test.ino example, with some modifications for the STM32 Blue pill board. When I send a message to the server, it returns a response. If I enable the debug by the serial port, the answer is complete, but when using the wifirecived function, the first character disappears, the S of SUCCESS does not reach me.

Code

#include <SerialESP8266wifi.h>

#define esp8266_reset_pin PC13 // Connect this pin to CH_PD on the esp8266, not reset. (let reset be unconnected)

#define WIFI_SSID "Rayen"
#define WIFI_PASS "87654321"

#define DST_IP "192.168.0.157"
#define DST_Port "9221"

// the last parameter sets the local echo option for the ESP8266 module..
SerialESP8266wifi wifi(Serial2, Serial2, esp8266_reset_pin,Serial); //adding Serial enabled local echo and wifi debug

String inputString;
boolean pasada = 1, stringComplete = false;
unsigned long nextPing = 0;

void setup() {
  bool conectado = 0;
  inputString.reserve(30);
  Serial2.begin(115200);
  Serial.begin(9600);
  while (!Serial)
    ;
  Serial.println("Starting wifi");

  wifi.setTransportToTCP();// this is also default
  // wifi.setTransportToUDP();//Will use UDP when connecting to server, default is TCP

  wifi.endSendWithNewline(true); // Will end all transmissions with a newline and carrage return 
  wifi.begin();

  //Turn on local ap and server (TCP)
 //wifi.startLocalAPAndServer(WIFI_SSID, WIFI_PASS, "5", "2121");
 //wifi.startLocalServer("2121");
 delay(10);
  conectado = wifi.connectToAP(WIFI_SSID, WIFI_PASS);
  while (!conectado) {
    delay(10);
  }
  delay(100);
  Serial.println("Envio AT+CIPMUX=1");
  Serial2.println("AT+CIPMUX=1");
  delay(100);
  conectado = wifi.connectToServer(DST_IP, "9221");
  delay(100);
  Serial.println("-----Fin Setup-----");
}

void loop() {
  if (pasada) {
    Serial.println("-----Enviando datos-----");
    Serial2.println("AT+CWJAP_CUR?");
    // wifi.writeCommand(SERVER,"AT+CWJAP_CUR?");
    delay(1000);
    wifi.send(SERVER,"/dev/Medi123/savean0=4.9&u=Medi123&p=12345&d=1421080339&z=p\n");

    delay(5000);
    pasada = 0;
        WifiMessage in = wifi.listenForIncomingMessage(5000);
    if (in.hasData) {
        Serial.print("Mensaje recibido:");
        Serial.print(in.message);
        if(in.channel == SERVER)
            Serial.println("Del Server");
        else{
            Serial.print("Por canal:");
            Serial.println(in.channel);
        }
    }

  }

}

Answer (serial debug)

JAP_CUR?

+CWJAP_CUR:"Rayen","d4:6e:0e:f3:65:2e",7,-56

OK
TAIP,"192.168.0.106"
+CIFSR:STAMAC,"bc:dd:c2:ed:8f:49"

OK

AT+CIPSEND=4,63

OK
> 
Recv 63 bytes

SEND OK

+IPD,4,36:SUCCESS

DATE=1420821139;1554917753

Mensaje recibido:UCCESS

DATE=1420821139;1554917753
Del Server

ekstrand / ESP8266wifi

Error receiving a message from the server #64