Connection of FS1000A with CC1101 on the ESP8266 board

Question

I have a problem receiving data from the transmitter. Packets are sent and the receiver registers them. But the data is empty.

The transmitter and receiver are connected to ESP8266 + NodeMCU V3. Two separate devices

The transmitter is the simplest sensor FS1000A.

TX technical data:

• Supply voltage: 3.5V - 12V
• Transmission speed: up to 9.6 Kb
• Operating frequency: 433 MHz
• Modulation: AM ASK/OOK
• Power: 10mW

TX code (FS1000A)

#include <Wire.h>

#define SENSOR_PIN 16

const int TX_NUMBER = 11887717;

RCSwitch mySwitch = RCSwitch();

void setup() {
  Serial.begin(9600);
  pinMode(SENSOR_PIN, INPUT);

  mySwitch.enableTransmit(TX_PIN);
  mySwitch.setPulseLength(320);
}

void loop() {
  sendAlert();
  delay(250);
}

void sendAlert() {
  Serial.println("SEND!!");
  mySwitch.send(TX_NUMBER, 24);
}

The receiver is CC1101:

RX code (CC1101)

#include <ELECHOUSE_CC1101_SRC_DRV.h>

void setup() {
  Serial.begin(9600);
  int gdo0 = 5;  // for ESP8266! GDO0 on pin 5 = D1.
  if (ELECHOUSE_cc1101.getCC1101()) {
    Serial.println("Connection OK");
  } else {
    Serial.println("Connection Error");
  }

  ELECHOUSE_cc1101.Init();               
  ELECHOUSE_cc1101.setGDO0(gdo0);
  
  ELECHOUSE_cc1101.setMHZ(433.92);         
  ELECHOUSE_cc1101.SpiWriteReg(CC1101_MDMCFG2, 0x30);
  ELECHOUSE_cc1101.SpiWriteReg(CC1101_MDMCFG4, 0xC8);
  ELECHOUSE_cc1101.SpiWriteReg(CC1101_MDMCFG3, 0x83);
  ELECHOUSE_cc1101.SpiWriteReg(CC1101_PKTCTRL0, 0x32);
  
  delay(1000);
  Serial.println("Rx Mode");
}

void loop() {
  if (ELECHOUSE_cc1101.CheckReceiveFlag()) {
    byte buffer[64];
    byte length = ELECHOUSE_cc1101.ReceiveData(buffer);

    Serial.print("Length: ");
    Serial.println(length);

    Serial.print("Received: ");
    if (length > 0) {
      for (byte i = 0; i < length; i++) {
        Serial.print(buffer[i], HEX);
        Serial.print(" ");
      }
      Serial.println();
    } else {
      Serial.println("No data");
    }

    int rssi = ELECHOUSE_cc1101.getRssi();
    Serial.print("RSSI: ");
    Serial.println(rssi);

    // Debugging received data
    if (length > 0) {
      for (byte i = 0; i < length; i++) {
        Serial.print("Byte ");
        Serial.print(i);
        Serial.print(": ");
        Serial.println(buffer[i], BIN); // Display as binary
      }
    }

    
    byte pktstatus = ELECHOUSE_cc1101.SpiReadStatus(CC1101_PKTSTATUS);
    Serial.print("PKTSTATUS: ");
    Serial.println(pktstatus, BIN);

    Serial.print("CRC_OK: ");
    Serial.println((pktstatus & 0x80) != 0);
    Serial.print("CS: ");
    Serial.println((pktstatus & 0x40) != 0);
    Serial.print("CRL: ");
    Serial.println((pktstatus & 0x20) != 0);
    Serial.print("RX_BYTE_OK: ");
    Serial.println((pktstatus & 0x10) != 0);
    Serial.print("RX_BYTE: ");
    Serial.println((pktstatus & 0x08) != 0);
    Serial.print("PKT_L: ");
    Serial.println((pktstatus & 0x04) != 0);

    delay(250);
  }
  delay(100);
}

The receiver registers packets but they are empty. And I would like to read the data in this form "11887717". I've tried various configurations but nothing helped. I am a beginner Arduino programmer. Please give me some tips or correct configuration for the receiver.

This is a preview of the serial port and what the receiver returns:

Connection OK
Rx Mode
Length: 0
Received: No data
RSSI: -25
PKTSTATUS: 11100000
CRC_OK: 1
CS: 1
CRL: 1
RX_BYTE_OK: 0
RX_BYTE: 0
PKT_L: 0