我正在努力从/向自定义蓝牙低功耗设备读取/发送数据。我使用的是Microchip RN4020蓝牙模块。
我发现的每个教程或示例都解释了如何将移动应用程序连接到设备，但我没有找到如何与它实际交互。 因此，这正是我能够和不能用我的应用程序做的事情。
对于现有的每一个特征我都做了以下事情：
gatt.readCharacteristic(services.get(i).getCharacteristics().get(j));
这是我打印值时的结果：
getStringValue= Mobi_F934��
getStringValue= null
getStringValue= ����d���
getStringValue= 001EC030F934
getStringValue= 2.1
getStringValue= 1.10
getStringValue= 1.10
getStringValue= Microchip
getStringValue= RN4020
getStringValue=
getStringValue=
我不知道这是否重要......
如何读取从我的BLE设备发送的数据？
编辑：我的Android代码
@TargetApi(21)
public class MainActivity extends ActionBarActivity {
private BluetoothAdapter mBluetoothAdapter;
private int REQUEST_ENABLE_BT = 1;
private Handler mHandler;
private static final long SCAN_PERIOD = 10000;
private BluetoothLeScanner mLEScanner;
private ScanSettings settings;
private List<ScanFilter> filters;
private BluetoothGatt mGatt;
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
mHandler = new Handler();
if (!getPackageManager().hasSystemFeature(PackageManager.FEATURE_BLUETOOTH_LE)) {
Toast.makeText(this, "BLE Not Supported",
Toast.LENGTH_SHORT).show();
finish();
}
// Initializes Bluetooth adapter
final BluetoothManager bluetoothManager =
(BluetoothManager) getSystemService(Context.BLUETOOTH_SERVICE);
mBluetoothAdapter = bluetoothManager.getAdapter();
}
@Override
protected void onResume() {
super.onResume();
// Ensures Bluetooth is available on the device and it is enabled. If not,
// displays a dialog requesting user permission to enable Bluetooth.
if (mBluetoothAdapter == null || !mBluetoothAdapter.isEnabled()) {
Intent enableBtIntent = new Intent(BluetoothAdapter.ACTION_REQUEST_ENABLE);
startActivityForResult(enableBtIntent, REQUEST_ENABLE_BT);
} else {
if (Build.VERSION.SDK_INT >= 21) {
mLEScanner = mBluetoothAdapter.getBluetoothLeScanner();
settings = new ScanSettings.Builder()
.setScanMode(ScanSettings.SCAN_MODE_LOW_LATENCY)
.build();
filters = new ArrayList<ScanFilter>();
}
scanLeDevice(true);
}
}
@Override
protected void onPause() {
super.onPause();
if (mBluetoothAdapter != null && mBluetoothAdapter.isEnabled()) {
scanLeDevice(false);
}
}
@Override
protected void onDestroy() {
if (mGatt == null) {
return;
}
mGatt.close();
mGatt = null;
super.onDestroy();
}
@Override
protected void onActivityResult(int requestCode, int resultCode, Intent data) {
if (requestCode == REQUEST_ENABLE_BT) {
if (resultCode == Activity.RESULT_CANCELED) {
//Bluetooth not enabled.
finish();
return;
}
}
super.onActivityResult(requestCode, resultCode, data);
}
private void scanLeDevice(final boolean enable) {
if (enable) {
mHandler.postDelayed(new Runnable() {
@Override
public void run() {
if (Build.VERSION.SDK_INT < 21) {
mBluetoothAdapter.stopLeScan(mLeScanCallback);
} else {
mLEScanner.stopScan(mScanCallback);
}
}
}, SCAN_PERIOD);
if (Build.VERSION.SDK_INT < 21) {
mBluetoothAdapter.startLeScan(mLeScanCallback);
} else {
mLEScanner.startScan(filters, settings, mScanCallback);
}
} else {
if (Build.VERSION.SDK_INT < 21) {
mBluetoothAdapter.stopLeScan(mLeScanCallback);
} else {
mLEScanner.stopScan(mScanCallback);
}
}
}
private ScanCallback mScanCallback = new ScanCallback() {
@Override
public void onScanResult(int callbackType, ScanResult result) {
Log.e("callbackType", "MAX " + String.valueOf(callbackType));
Log.e("result", "MAX " + result.toString());
BluetoothDevice btDevice = result.getDevice();
connectToDevice(btDevice);
}
@Override
public void onBatchScanResults(List<ScanResult> results) {
for (ScanResult sr : results) {
Log.e("ScanResult - Results", "MAX " + sr.toString());
}
}
@Override
public void onScanFailed(int errorCode) {
Log.e("Scan Failed", "MAX " + "Error Code: " + errorCode);
}
};
private BluetoothAdapter.LeScanCallback mLeScanCallback =
new BluetoothAdapter.LeScanCallback() {
@Override
public void onLeScan(final BluetoothDevice device, int rssi,
byte[] scanRecord) {
runOnUiThread(new Runnable() {
@Override
public void run() {
Log.e("onLeScan", "MAX " + device.toString());
connectToDevice(device);
}
});
}
};
public void connectToDevice(BluetoothDevice device) {
if (mGatt == null) {
mGatt = device.connectGatt(this, false, gattCallback);
scanLeDevice(false);// will stop after first device detection
}
}
private final BluetoothGattCallback gattCallback = new BluetoothGattCallback() {
@Override
public void onConnectionStateChange(BluetoothGatt gatt, int status, int newState) {
Log.e("onConnectionStateChange", "MAX " + "Status: " + status);
switch (newState) {
case BluetoothProfile.STATE_CONNECTED:
Log.e("gattCallback", "MAX " + "STATE_CONNECTED");
gatt.discoverServices();
break;
case BluetoothProfile.STATE_DISCONNECTED:
Log.e("gattCallback", "MAX " + "STATE_DISCONNECTED");
break;
default:
Log.e("gattCallback", "MAX " + "STATE_OTHER");
}
}
@Override
public void onServicesDiscovered(BluetoothGatt gatt, int status) {
List<BluetoothGattService> services = gatt.getServices();
Log.e("onServicesDiscovered", "MAX " + services.toString());
/*
for(int i = 0; i < services.size(); i++){
for (int j = 0; j < services.get(i).getCharacteristics().size(); j++){
Log.e("MAX", "i= " + i + " j= " + j);
gatt.readCharacteristic(services.get(i).getCharacteristics().get
(j));
}
}
*/
gatt.readCharacteristic(services.get(0).getCharacteristics().get(0));
}
@Override
public void onCharacteristicRead(BluetoothGatt gatt,
BluetoothGattCharacteristic
characteristic, int status) {
Log.e("onCharacteristicRead", "MAX " + characteristic.toString());
Log.e("onCharacteristicRead", "MAX " +characteristic.getStringValue(0));
//gatt.disconnect();
}
};
}
编辑2：我的arduino代码
#include <SoftwareSerial.h>
/* Set up BT to arduino uno
BT RN4020 Arduino Uno
------------------------------------------------
Red 3.3V
Green GND
Yellow(RX) TX (digital pin 1)
Orange(TX) RX (digital pin 0)
White PIN 8 (!) This is not GND (!)
Blue 3.3V (Ioref can also be used)
*/
/*
-----------------------------------------------------------------------------
-----EXPLANATION PROGRAM-----------------------------------------------------
----------------------------
Eerst wordt de BT module geïnitialiseerd door verschillende commando's door te
sturen. Bij elk commando wordt gecheckt of de BT module het juiste antwoord
heeft teruggestuurd.
De initialisatie moet gebeuren in CMD mode, de CMD/MLDP pin moet laag zijn. Na
de initialisatie checken we tot de BT module is geconnecteerd met het device.
Als de BT module geconnecteerd is zetten we deze uit CMD mode en in MLDP mode
om het verzenden en ontvangen van data te ondersteunen. Daarna zenden we om de
seconde de string 'test' door.
Dit gebeurt zolang het device geconnecteerd is met de BT module.
------------------------------------------------------------------------------
------------------------------------------------------------------------------
-----------------------------
*/
int CMD_MLD_pin = 8; // IO pin for CMD/MLDP pin (LOW --> CMD, HIGH --> MLDP)
void setup() // Initialising BT RN4020
{
pinMode(CMD_MLD_pin, OUTPUT);
digitalWrite(CMD_MLD_pin, LOW); // put CMD/MLDP pin LOW for CMD mode
delay(5000);
/* Initialize Bluetooth */
Serial.begin(115200); // Set up serial connection with required baud rate of
// 115200
delay(1500);
Serial.println("R,1"); //Reboot
while(!Serial.find("Reboot")){} // Waiting until BT RN4020 responds the
required string
while(!Serial.find("CMD")){}
//delay(2000);
Serial.println("SF,1"); // Factory reset
while(!Serial.find("AOK")){}
//delay(1500);
Serial.println("SR,32000000"); // Set device as peripheral
while(!Serial.find("AOK")){}
Serial.println("S-, Mobi"); // Change name of BT
while(!Serial.find("AOK")){}
//delay(1500);
Serial.println("R,1"); // Reboot to make changes effective
while(!Serial.find("Reboot")){}
while(!Serial.find("CMD")){}
//delay(2000);
}
void loop()
{
// Wait until the device responds it is connected
// If the device is connected we will send every second the string 'test'
while(!Serial.find("Connected")){} // Wait until BT RN4020 is connected to a
// device
digitalWrite(CMD_MLD_pin, HIGH); // Go to MLDP to support data stream
while(!Serial.find("MLDP")){} // Wait until BT RN4020 is effectively in MLDP
// mode
delay(500);
while (!Serial.find("Connection End")) // Send string to BTRN4020 while the
// BT RN4020 is conected to a device
{
Serial.println("test");
delay(1000);
}
}
答案 0 :(得分：2)
在提出问题几个月后，我设法解决了我的问题。那时我忘了分享我的解决方案。 无论如何，迟到总比没有好！
这是我在通过BLE测试android-TI sensortag通信时编写的一些代码。
https://github.com/maxhelskens/SmergyBicycle
提供完整的示例package com.example.max.smergy;
import android.annotation.TargetApi;
import android.app.Activity;
import android.app.ProgressDialog;
import android.bluetooth.BluetoothAdapter;
import android.bluetooth.BluetoothDevice;
import android.bluetooth.BluetoothGatt;
import android.bluetooth.BluetoothGattCallback;
import android.bluetooth.BluetoothGattCharacteristic;
import android.bluetooth.BluetoothGattDescriptor;
import android.bluetooth.BluetoothGattService;
import android.bluetooth.BluetoothManager;
import android.bluetooth.BluetoothProfile;
import android.bluetooth.le.BluetoothLeScanner;
import android.bluetooth.le.ScanCallback;
import android.bluetooth.le.ScanFilter;
import android.bluetooth.le.ScanResult;
import android.bluetooth.le.ScanSettings;
import android.content.Context;
import android.content.Intent;
import android.content.pm.PackageManager;
import android.os.Build;
import android.os.Bundle;
import android.os.Handler;
import android.os.Message;
import android.support.v7.app.AppCompatActivity;
import android.support.v7.widget.Toolbar;
import android.util.Log;
import android.util.SparseArray;
import android.view.Menu;
import android.view.MenuItem;
import android.widget.TextView;
import android.widget.Toast;
import java.util.ArrayList;
import java.util.List;
import java.util.UUID;
@TargetApi(21)
public class MainActivity extends AppCompatActivity {
private static final String TAG = "MainActivity";
private static final String DEVICE_NAME = "SensorTag";
/* Humidity Service */
private static final UUID HUMIDITY_SERVICE = UUID.fromString("F000AA20-0451-4000-B000-000000000000");
private static final UUID HUMIDITY_DATA_CHAR = UUID.fromString("f000aa21-0451-4000-b000-000000000000");
private static final UUID HUMIDITY_CONFIG_CHAR = UUID.fromString("f000aa22-0451-4000-b000-000000000000");
/* magneto Service */
private static final UUID MAGNETO_SERVICE = UUID.fromString("F000AA80-0451-4000-B000-000000000000");
private static final UUID MAGNETO_DATA_CHAR = UUID.fromString("f000aa81-0451-4000-b000-000000000000");
private static final UUID MAGNETO_CONFIG_CHAR = UUID.fromString("f000aa82-0451-4000-b000-000000000000");
/* Barometric Pressure Service */
private static final UUID PRESSURE_SERVICE = UUID.fromString("f000aa40-0451-4000-b000-000000000000");
private static final UUID PRESSURE_DATA_CHAR = UUID.fromString("f000aa41-0451-4000-b000-000000000000");
private static final UUID PRESSURE_CONFIG_CHAR = UUID.fromString("f000aa42-0451-4000-b000-000000000000");
private static final UUID PRESSURE_CAL_CHAR = UUID.fromString("f000aa43-0451-4000-b000-000000000000");
/* Client Configuration Descriptor */
private static final UUID CONFIG_DESCRIPTOR = UUID.fromString("00002902-0000-1000-8000-00805f9b34fb");
private BluetoothAdapter mBluetoothAdapter;
private SparseArray<BluetoothDevice> mDevices;
private BluetoothGatt mGatt;
private TextView mTemperature, mHumidity, mPressure;
private ProgressDialog mProgress;
private int REQUEST_ENABLE_BT = 1;
private BluetoothLeScanner mLEScanner;
private ScanSettings settings;
private List<ScanFilter> filters;
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
setProgressBarIndeterminate(true);
// Find the toolbar view inside the activity layout
Toolbar toolbar = (Toolbar) findViewById(R.id.toolbar);
// Sets the Toolbar to act as the ActionBar for this Activity window.
// Make sure the toolbar exists in the activity and is not null
setSupportActionBar(toolbar);
/*
* We are going to display the results in some text fields
*/
mTemperature = (TextView) findViewById(R.id.text_temperature);
mHumidity = (TextView) findViewById(R.id.text_humidity);
mPressure = (TextView) findViewById(R.id.text_pressure);
//Check if BLE is supported
if (!getPackageManager().hasSystemFeature(PackageManager.FEATURE_BLUETOOTH_LE)) {
Toast.makeText(this, "BLE Not Supported",
Toast.LENGTH_SHORT).show();
finish();
}
final BluetoothManager bluetoothManager =
(BluetoothManager) getSystemService(Context.BLUETOOTH_SERVICE);
mBluetoothAdapter = bluetoothManager.getAdapter();
mDevices = new SparseArray<BluetoothDevice>();
/*
* A progress dialog will be needed while the connection process is
* taking place
*/
mProgress = new ProgressDialog(this);
mProgress.setIndeterminate(true);
mProgress.setCancelable(false);
}
@Override
protected void onResume() {
super.onResume();
if (mBluetoothAdapter == null || !mBluetoothAdapter.isEnabled()) {
Intent enableBtIntent = new Intent(BluetoothAdapter.ACTION_REQUEST_ENABLE);
startActivityForResult(enableBtIntent, REQUEST_ENABLE_BT);
} else {
if (Build.VERSION.SDK_INT >= 21) {
mLEScanner = mBluetoothAdapter.getBluetoothLeScanner();
settings = new ScanSettings.Builder()
.setScanMode(ScanSettings.SCAN_MODE_LOW_LATENCY)
.build();
filters = new ArrayList<ScanFilter>();
}
}
clearDisplayValues();
}
@Override
protected void onPause() {
super.onPause();
//Make sure dialog is hidden
mProgress.dismiss();
//Cancel any scans in progress
mHandler.removeCallbacks(mStopRunnable);
mHandler.removeCallbacks(mStartRunnable);
if (Build.VERSION.SDK_INT < 21) {
mBluetoothAdapter.stopLeScan(mLeScanCallback);
} else {
mLEScanner.stopScan(mScanCallback);
}
}
@Override
protected void onStop() {
super.onStop();
//Disconnect from any active tag connection
if (mGatt != null) {
mGatt.close();
mGatt = null;
}
}
@Override
protected void onDestroy() {
if (mGatt == null) {
return;
}
mGatt.close();
mGatt = null;
super.onDestroy();
}
@Override
protected void onActivityResult(int requestCode, int resultCode, Intent data) {
if (requestCode == REQUEST_ENABLE_BT) {
if (resultCode == Activity.RESULT_CANCELED) {
//Bluetooth not enabled.
finish();
return;
}
}
super.onActivityResult(requestCode, resultCode, data);
}
// Menu icons are inflated just as they were with actionbar
@Override
public boolean onCreateOptionsMenu(Menu menu) {
// Inflate the menu; this adds items to the action bar if it is present.
getMenuInflater().inflate(R.menu.menu_main, menu);
//Add any device elements we've discovered to the overflow menu
for (int i=0; i < mDevices.size(); i++) {
BluetoothDevice device = mDevices.valueAt(i);
menu.add(0, mDevices.keyAt(i), 0, device.getName());
}
return true;
}
@Override
public boolean onOptionsItemSelected(MenuItem item) {
switch (item.getItemId()) {
case R.id.bluetoothSearch:
mDevices.clear();
startScan();
//scanLeDevice(true);
return true;
default:
//Obtain the discovered device to connect with
BluetoothDevice device = mDevices.get(item.getItemId());
Log.i(TAG, "Connecting to " + device.getName());
/*
* Make a connection with the device
*/
connectToDevice(device);
//Display progress UI
mHandler.sendMessage(Message.obtain(null, MSG_PROGRESS, "Connecting to " + device.getName() + "..."));
return super.onOptionsItemSelected(item);
}
}
private void clearDisplayValues() {
mTemperature.setText("---");
mHumidity.setText("---");
mPressure.setText("---");
}
private Runnable mStopRunnable = new Runnable() {
@Override
public void run() {
stopScan();
}
};
private Runnable mStartRunnable = new Runnable() {
@Override
public void run() {
startScan();
}
};
private void startScan() {
if (Build.VERSION.SDK_INT < 21) {
mBluetoothAdapter.startLeScan(mLeScanCallback);
} else {
mLEScanner.startScan(filters, settings, mScanCallback);
}
setProgressBarIndeterminateVisibility(true);
mHandler.postDelayed(mStopRunnable, 2500);
}
private void stopScan() {
if (Build.VERSION.SDK_INT < 21) {
mBluetoothAdapter.stopLeScan(mLeScanCallback);
} else {
mLEScanner.stopScan(mScanCallback);
}
setProgressBarIndeterminateVisibility(false);
}
private BluetoothAdapter.LeScanCallback mLeScanCallback =
new BluetoothAdapter.LeScanCallback() {
@Override
public void onLeScan(final BluetoothDevice device, int rssi, byte[] scanRecord) {
Log.i("onLeScan", device.toString());
mDevices.put(device.hashCode(), device);
//Update the overflow menu
invalidateOptionsMenu();
}
};
/*
private void scanLeDevice(final boolean enable) {
if (enable) {
mHandler.postDelayed(new Runnable() {
@Override
public void run() {
if (Build.VERSION.SDK_INT < 21) {
mBluetoothAdapter.stopLeScan(mLeScanCallback);
} else {
mLEScanner.stopScan(mScanCallback);
}
}
}, SCAN_PERIOD);
if (Build.VERSION.SDK_INT < 21) {
mBluetoothAdapter.startLeScan(mLeScanCallback);
} else {
mLEScanner.startScan(filters, settings, mScanCallback);
}
} else {
if (Build.VERSION.SDK_INT < 21) {
mBluetoothAdapter.stopLeScan(mLeScanCallback);
} else {
mLEScanner.stopScan(mScanCallback);
}
}
}
*/
private ScanCallback mScanCallback = new ScanCallback() {
@Override
public void onScanResult(int callbackType, ScanResult result) {
Log.i("callbackType", String.valueOf(callbackType));
Log.i("result", result.toString());
BluetoothDevice btDevice = result.getDevice();
mDevices.put(btDevice.hashCode(), btDevice);
//Update the overflow menu
invalidateOptionsMenu();
}
@Override
public void onBatchScanResults(List<ScanResult> results) {
for (ScanResult sr : results) {
Log.i("ScanResult - Results", sr.toString());
}
}
@Override
public void onScanFailed(int errorCode) {
Log.e("Scan Failed", "Error Code: " + errorCode);
}
};
public void connectToDevice(BluetoothDevice device) {
if (mGatt == null) {
mGatt = device.connectGatt(this, false, gattCallback);
stopScan();
}
}
/*
* In this callback, we've created a bit of a state machine to enforce that only
* one characteristic be read or written at a time until all of our sensors
* are enabled and we are registered to get notifications.
*/
private final BluetoothGattCallback gattCallback = new BluetoothGattCallback() {
/* State Machine Tracking */
private int mState = 0;
private void reset() { mState = 0; }
private void advance() { mState++; }
/*
* Send an enable command to each sensor by writing a configuration
* characteristic. This is specific to the SensorTag to keep power
* low by disabling sensors you aren't using.
*/
private void enableNextSensor(BluetoothGatt gatt) {
BluetoothGattCharacteristic characteristic;
switch (mState) {
/*
case 0:
Log.d(TAG, "Enabling pressure cal");
characteristic = gatt.getService(PRESSURE_SERVICE)
.getCharacteristic(PRESSURE_CONFIG_CHAR);
characteristic.setValue(new byte[] {0x02});
break;
case 1:
Log.d(TAG, "Enabling pressure");
characteristic = gatt.getService(PRESSURE_SERVICE)
.getCharacteristic(PRESSURE_CONFIG_CHAR);
characteristic.setValue(new byte[] {0x01});
break; */
case 0:
Log.d(TAG, "Enabling humidity");
characteristic = gatt.getService(HUMIDITY_SERVICE)
.getCharacteristic(HUMIDITY_CONFIG_CHAR);
characteristic.setValue(new byte[] {0x01});
break;
case 1:
Log.d(TAG, "Enabling magneto");
characteristic = gatt.getService(MAGNETO_SERVICE)
.getCharacteristic(MAGNETO_CONFIG_CHAR);
characteristic.setValue(new byte[] {(byte)0x7F, (byte)0x00});
break;
default:
mHandler.sendEmptyMessage(MSG_DISMISS);
Log.i(TAG, "All Sensors Enabled");
return;
}
gatt.writeCharacteristic(characteristic);
}
/*
* Read the data characteristic's value for each sensor explicitly
*/
private void readNextSensor(BluetoothGatt gatt) {
BluetoothGattCharacteristic characteristic;
switch (mState) {
/*
case 0:
Log.d(TAG, "Reading pressure cal");
characteristic = gatt.getService(PRESSURE_SERVICE)
.getCharacteristic(PRESSURE_CAL_CHAR);
break;
case 1:
Log.d(TAG, "Reading pressure");
characteristic = gatt.getService(PRESSURE_SERVICE)
.getCharacteristic(PRESSURE_DATA_CHAR);
break;*/
case 0:
Log.d(TAG, "Reading humidity");
characteristic = gatt.getService(HUMIDITY_SERVICE)
.getCharacteristic(HUMIDITY_DATA_CHAR);
break;
case 1:
Log.d(TAG, "Reading magneto");
characteristic = gatt.getService(MAGNETO_SERVICE)
.getCharacteristic(MAGNETO_DATA_CHAR);
break;
default:
mHandler.sendEmptyMessage(MSG_DISMISS);
Log.i(TAG, "All Sensors Enabled");
return;
}
gatt.readCharacteristic(characteristic);
}
/*
* Enable notification of changes on the data characteristic for each sensor
* by writing the ENABLE_NOTIFICATION_VALUE flag to that characteristic's
* configuration descriptor.
*/
private void setNotifyNextSensor(BluetoothGatt gatt) {
BluetoothGattCharacteristic characteristic;
switch (mState) {
/*
case 0:
Log.d(TAG, "Set notify pressure cal");
characteristic = gatt.getService(PRESSURE_SERVICE)
.getCharacteristic(PRESSURE_CAL_CHAR);
break;
case 1:
Log.d(TAG, "Set notify pressure");
characteristic = gatt.getService(PRESSURE_SERVICE)
.getCharacteristic(PRESSURE_DATA_CHAR);
break;*/
case 0:
Log.d(TAG, "Set notify humidity");
characteristic = gatt.getService(HUMIDITY_SERVICE)
.getCharacteristic(HUMIDITY_DATA_CHAR);
break;
case 1:
Log.d(TAG, "Set notify magneto");
characteristic = gatt.getService(MAGNETO_SERVICE)
.getCharacteristic(MAGNETO_DATA_CHAR);
break;
default:
mHandler.sendEmptyMessage(MSG_DISMISS);
Log.i(TAG, "All Sensors Enabled");
return;
}
//Enable local notifications
gatt.setCharacteristicNotification(characteristic, true);
//Enabled remote notifications
BluetoothGattDescriptor desc = characteristic.getDescriptor(CONFIG_DESCRIPTOR);
desc.setValue(BluetoothGattDescriptor.ENABLE_NOTIFICATION_VALUE);
gatt.writeDescriptor(desc);
}
@Override
public void onConnectionStateChange(BluetoothGatt gatt, int status, int newState) {
Log.i("onConnectionStateChange", "Status: " + status);
if (status == BluetoothGatt.GATT_SUCCESS && newState == BluetoothProfile.STATE_CONNECTED) {
/*
* Once successfully connected, we must next discover all the services on the
* device before we can read and write their characteristics.
*/
gatt.discoverServices();
mHandler.sendMessage(Message.obtain(null, MSG_PROGRESS, "Discovering Services..."));
} else if (status == BluetoothGatt.GATT_SUCCESS && newState == BluetoothProfile.STATE_DISCONNECTED) {
/*
* If at any point we disconnect, send a message to clear the weather values
* out of the UI
*/
mHandler.sendEmptyMessage(MSG_CLEAR);
} else if (status != BluetoothGatt.GATT_SUCCESS) {
/*
* If there is a failure at any stage, simply disconnect
*/
gatt.close();
}
}
@Override
public void onServicesDiscovered(BluetoothGatt gatt, int status) {
List<BluetoothGattService> services = gatt.getServices();
Log.i("onServicesDiscovered", services.toString());
mHandler.sendMessage(Message.obtain(null, MSG_PROGRESS, "Enabling Sensors..."));
/*
* With services discovered, we are going to reset our state machine and start
* working through the sensors we need to enable
*/
reset();
enableNextSensor(gatt);
}
@Override
public void onCharacteristicRead(BluetoothGatt gatt, BluetoothGattCharacteristic characteristic, int status) {
Log.i("onCharacteristicRead", characteristic.toString());
//For each read, pass the data up to the UI thread to update the display
if (HUMIDITY_DATA_CHAR.equals(characteristic.getUuid())) {
mHandler.sendMessage(Message.obtain(null, MSG_HUMIDITY, characteristic));
}
if (MAGNETO_DATA_CHAR.equals(characteristic.getUuid())) {
mHandler.sendMessage(Message.obtain(null, MSG_MAGNETO, characteristic));
}
if (PRESSURE_DATA_CHAR.equals(characteristic.getUuid())) {
mHandler.sendMessage(Message.obtain(null, MSG_PRESSURE, characteristic));
}
if (PRESSURE_CAL_CHAR.equals(characteristic.getUuid())) {
mHandler.sendMessage(Message.obtain(null, MSG_PRESSURE_CAL, characteristic));
}
//After reading the initial value, next we enable notifications
setNotifyNextSensor(gatt);
}
@Override
public void onCharacteristicWrite(BluetoothGatt gatt, BluetoothGattCharacteristic characteristic, int status) {
//After writing the enable flag, next we read the initial value
readNextSensor(gatt);
}
@Override
public void onCharacteristicChanged(BluetoothGatt gatt, BluetoothGattCharacteristic characteristic) {
/*
* After notifications are enabled, all updates from the device on characteristic
* value changes will be posted here. Similar to read, we hand these up to the
* UI thread to update the display.
*/
if (HUMIDITY_DATA_CHAR.equals(characteristic.getUuid())) {
mHandler.sendMessage(Message.obtain(null, MSG_HUMIDITY, characteristic));
}
if (MAGNETO_DATA_CHAR.equals(characteristic.getUuid())) {
mHandler.sendMessage(Message.obtain(null, MSG_MAGNETO, characteristic));
}
if (PRESSURE_DATA_CHAR.equals(characteristic.getUuid())) {
mHandler.sendMessage(Message.obtain(null, MSG_PRESSURE, characteristic));
}
if (PRESSURE_CAL_CHAR.equals(characteristic.getUuid())) {
mHandler.sendMessage(Message.obtain(null, MSG_PRESSURE_CAL, characteristic));
}
}
@Override
public void onDescriptorWrite(BluetoothGatt gatt, BluetoothGattDescriptor descriptor, int status) {
//Once notifications are enabled, we move to the next sensor and start over with enable
advance();
enableNextSensor(gatt);
}
@Override
public void onReadRemoteRssi(BluetoothGatt gatt, int rssi, int status) {
Log.d(TAG, "Remote RSSI: " + rssi);
}
private String connectionState(int status) {
switch (status) {
case BluetoothProfile.STATE_CONNECTED:
return "Connected";
case BluetoothProfile.STATE_DISCONNECTED:
return "Disconnected";
case BluetoothProfile.STATE_CONNECTING:
return "Connecting";
case BluetoothProfile.STATE_DISCONNECTING:
return "Disconnecting";
default:
return String.valueOf(status);
}
}
};
/*
* We have a Handler to process event results on the main thread
*/
private static final int MSG_HUMIDITY = 101;
private static final int MSG_PRESSURE = 102;
private static final int MSG_PRESSURE_CAL = 103;
private static final int MSG_MAGNETO = 104;
private static final int MSG_PROGRESS = 201;
private static final int MSG_DISMISS = 202;
private static final int MSG_CLEAR = 301;
private Handler mHandler = new Handler() {
@Override
public void handleMessage(Message msg) {
BluetoothGattCharacteristic characteristic;
switch (msg.what) {
case MSG_HUMIDITY:
characteristic = (BluetoothGattCharacteristic) msg.obj;
if (characteristic.getValue() == null) {
Log.w(TAG, "Error obtaining humidity value");
return;
}
updateHumidityValues(characteristic);
break;
case MSG_MAGNETO:
characteristic = (BluetoothGattCharacteristic) msg.obj;
if (characteristic.getValue() == null) {
Log.w(TAG, "Error obtaining magneto value");
return;
}
updateMagnetoValues(characteristic);
break;
case MSG_PRESSURE:
characteristic = (BluetoothGattCharacteristic) msg.obj;
if (characteristic.getValue() == null) {
Log.w(TAG, "Error obtaining pressure value");
return;
}
updatePressureValue(characteristic);
break;
case MSG_PRESSURE_CAL:
characteristic = (BluetoothGattCharacteristic) msg.obj;
if (characteristic.getValue() == null) {
Log.w(TAG, "Error obtaining cal value");
return;
}
updatePressureCals(characteristic);
break;
case MSG_PROGRESS:
mProgress.setMessage((String) msg.obj);
if (!mProgress.isShowing()) {
mProgress.show();
}
break;
case MSG_DISMISS:
mProgress.hide();
break;
case MSG_CLEAR:
clearDisplayValues();
break;
}
}
};
/* Methods to extract sensor data and update the UI */
private void updateHumidityValues(BluetoothGattCharacteristic characteristic) {
double humidity = SensorTagData.extractHumidity(characteristic);
mHumidity.setText(String.format("%.0f%%", humidity));
}
ArrayList<Double> magnets = new ArrayList<>();
double average = 0;
int count = -1;
int wait5 = 0;
private void updateMagnetoValues(BluetoothGattCharacteristic characteristic) {
double magnet = SensorTagData.extractMagnetoX(characteristic);
Log.e("MAGNETO", "" + magnet);
magnet = Math.abs(magnet);
if (wait5 == 0) {
if (magnet > average + 300 || magnet < average - 300) {
wait5 = 6;
count ++;
mPressure.setText("" + count);
}
}
else {
wait5 --;
}
if (magnets.size() >= 5) {
magnets.remove(0);
}
magnets.add(magnet);
double sum = 0;
for (int i = 0; i < magnets.size(); i++) {
sum += magnets.get(i);
}
average = sum/magnets.size();
average = magnets.get(2);
//mHumidity.setText(String.format("%.0f%%", humidity));
}
private int[] mPressureCals;
private void updatePressureCals(BluetoothGattCharacteristic characteristic) {
mPressureCals = SensorTagData.extractCalibrationCoefficients(characteristic);
}
private void updatePressureValue(BluetoothGattCharacteristic characteristic) {
if (mPressureCals == null) return;
double pressure = SensorTagData.extractBarometer(characteristic, mPressureCals);
double temp = SensorTagData.extractBarTemperature(characteristic, mPressureCals);
mTemperature.setText(String.format("%.1f\u00B0C", temp));
mPressure.setText(String.format("%.2f", pressure));
}
}
答案 1 :(得分：1)
嗯，我认为你应该多阅读一下如何使用这些特性。默认情况下，您的芯片具有许多特性，其中包含来自芯片的信息。为了发送和接收数据，您必须先对芯片进行编程，以便通过特定的特性发送数据，并通过另一个特定的特性接收数据。
某些芯片具有默认的Rx和Tx特性，您应该使用这些特性来发送和接收数据。这些特性充当BLE与芯片上的Tx和Rx引脚之间的流水线，并将简单地回显所有数据。
或者，您可以在BLE服务上创建自己的特征，并编写自己的发送和接收协议。
让我举个简单的例子：
让我们假设您使用芯片的默认特性来发送数据。该数据必须以小块发送，例如20个字节。要在Android上读取此数据，您必须首先获取该特征的描述符并启用通知。这将告诉Android收听该特性并监控更改。
characteristic = gatt.getService(UUID.fromString(SERVICE_UUID)).getCharacteristic(UUID.fromString(CHARACTERISTIC_UUID)); //Find you characteristic
mGatt.setCharacteristicNotification(characteristic, true); //Tell you gatt client that you want to listen to that characteristic
List<BluetoothGattDescriptor> descriptors = characteristic.getDescriptors(); //find the descriptors on the characteristic
BluetoothGattDescriptor descriptor = descriptors.get(1); //get the right descriptor for setting notifications
descriptor.setValue(BluetoothGattDescriptor.ENABLE_NOTIFICATION_VALUE);
mGatt.writeDescriptor(descriptor); //apply these changes to the ble chip to tell it we are ready for the data
执行此操作后，您将能够使用onCharacteristicChanged方法读取数据：
@Override
public void onCharacteristicChanged(BluetoothGatt gatt, BluetoothGattCharacteristic characteristic) {
super.onCharacteristicChanged(gatt, characteristic);
String data = characteristic.getStringValue(0);
}
发送数据会更简单一些。找到特征后，您只需将数据写入块中即可：
byte[] value = new byte[1];
value[0] = (byte) (21 & 0xFF); //your data
characteristic.setValue(value); //assign the new data value to the characteristic
boolean success = mBluetoothGatt.writeCharacteristic(charac); //write to the chip
一旦写入，芯片将刷新特性并将数据发送到芯片的Tx引脚。
编辑：
通过the user manual for RN4020，您可以看到芯片具有默认的电池服务以及模型，软件版本等的一些特性，但没有默认的Rx和Tx特性。
在这种情况下，您在代码中找到的特征只是设备信息，几乎没用。您必须首先在芯片上定义自己的私有服务和特性。请查看manual中的示例3-1。使用唯一的UUID定义私有服务和特性后，您可以将数据写入该数据，并使用相同的UUID在Android上读取它。
答案 2 :(得分：-1)
I got the RN4020 working in processing.org in combination with the arduino platform. If you're still interesting let me know.
Do you have the SW-wake and HW wake pin connected to vcc 3.3v? You don't have to go to CMD everythime you start.
I just connectecd CDM directly to VCC. Once you give the reboot command it goes directly to MLDP.