How to get bluetooth working in cordova mobile app?

Question

Bluetooth

Hello. Need help with bluetooth connection in cordova mobile app. Tried plugins: cordova-plugin-bluetoothle, cordova-plugin-ble-central, @iotize/cordova-plugin-iotize-ble,

I'm doing something wrong. Nothing wants to work. Tell me who did it. The task is to scan the environment and measure the signal level to another device. Thanks in advance.

new Promise(function (resolve) {
    bluetoothle.initialize(resolve, { request: true, statusReceiver: false });
  }).then(initializeSuccess, handleError);

  function initializeSuccess(result) {
    if (result.status === "enabled") {
      //myApp.alert("Bluetooth is enabled.");
      // myApp.alert(result);
      startScan();
    }
    else {
    }
  }

  function handleError(error) {
    var msg;
  }

  // function log(msg, level) {
  //   level = level || "log";
  //   if (typeof msg === "object") {
  //     msg = JSON.stringify(msg, null, "  ");
  //   }
  //   console.log(msg);
  //   if (level === "status" || level === "error") {
  //     var msgDiv = document.createElement("div");
  //     msgDiv.textContent = msg;
  //     if (level === "error") {
  //       msgDiv.style.color = "red";
  //     }
  //     msgDiv.style.padding = "5px 0";
  //     msgDiv.style.borderBottom = "rgb(192,192,192) solid 1px";
  //     document.getElementById("output").appendChild(msgDiv);
  //   }
  // }

  var foundDevices = [];

  function startScan() {
    bluetoothle.startScan(startScanSuccess, handleError, { services: [] });
  }

  function startScanSuccess(result) {
    alert("startScanSuccess(" + result.status + ")");
    if (result.status === "scanStarted") {
      alert("Scanning for devices (will continue to scan until you select a device)...", "status");

    }
    else if (result.status === "scanResult") {
      if (!foundDevices.some(function (device) {
          return device.address === result.address;
        })) {
        addDevice(result.name, result.address);
      }
    }
  }

  // function retrieveConnectedSuccess(result) {
  //   log("retrieveConnectedSuccess()");
  //   log(result);
  //   result.forEach(function (device) {
  //     addDevice(device.name, device.address);
  //   });
  // }

  function addDevice(name, address) {
   alert("name = " + name + ' address = ' + address);
  }