Connecting to multiple devices using BLE?

[ejeng888]

Prerequisites

• I checked the documentation and FAQ without finding a solution
• I checked to make sure that this issue has not already been filed
• I'm sure that question is related to the library itself and not Bluetooth Low Energy or Classic in general. If that so, please post your question on StackOverflow.
• I'm running the latest version

Question

I'm trying to make an app that allows for my phone to connect to multiple devices over BLE so I could send the same data to each one. I could not find any documentation relating to this or showing any examples. Right now, my code is repeatedly throwing out connection errors such as:

LOG List of connected devices: []
LOG Connection error: [BleError: Device ? is already connected]
LOG Connection error: [BleError: Operation was cancelled]
LOG Connection error: [BleError: Device ? is already connected]
LOG Connection error: [BleError: Operation was cancelled]

I believe the error has to do with my usage of bleManager.startDeviceScan as it looks like it's continuously scanning for devices when I currently want it to only find 2 devices and then stop. In addition, when I change it to only look for 1 device instead of 2, the code works and I am able to send data successfully.

Any help is appreciated. Thank you.

Question related code

number_of_devices = 2
const searchAndConnectToDevice = () => {
    for(let i = 1; i < number_of_devices + 1; i++){
      setConnected(false);
      bleManager.startDeviceScan(null, null, (error, device) => {
        if (error) {
          console.error(error);
          setConnectionStatus("Error searching for devices");
          return;
        }

        //Check for esp 32 devices
        let esp32_name = "sensor_" + i;
        if (device.name === esp32_name) {
          bleManager.stopDeviceScan();
          console.log("Device name is: ", esp32_name);
          setConnectionStatus(`Connecting...`);
          connectToDevice(device);
          setConnected(true);
        }
      });
    }
    
  };

  const connectToDevice = async (device) => {
    console.log("connect start");
    try {
      const connectedDevice = await device.connect();
      console.log("Device Id is: ", connectedDevice.id)
      
      //Put deviceID into connectedDevices array
      setDeviceIDs((prevDevices) => [...prevDevices, connectedDevice.id]);
      console.log("List of connected devices: ", deviceIDs)
      await connectedDevice.discoverAllServicesAndCharacteristics();

      return connectedDevice;
    } catch (error) {
      console.log("Connection error: ", error);
      setConnectionStatus((prevStatus) => ({
        ...prevStatus,
        [device.id]: "Error in Connection",
      }));
    }
  };