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parse the weight data in the Bluetooth Advertisement Frame

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This commit is contained in:
OliE
2016-12-21 13:47:29 +01:00
parent 829cc7ba9f
commit 03f01f52f2
1 changed files with 95 additions and 89 deletions
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184
android_app/app/src/main/java/com/health/openscale/core/BluetoothMiScale.java
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@@ -74,6 +74,11 @@ public class BluetoothMiScale extends BluetoothCommunication {
{
if (device.getName().equals(btDeviceName)) {
Log.d("BluetoothMiScale", "Mi Scale found trying to connect...");
final byte[] weightData = Arrays.copyOfRange(scanRecord, 21, 31);
weightData[0] = 0x62; // Set weight remove to false to come through parse bytes
parseBytes(weightData);
bluetoothGatt = device.connectGatt(context, false, gattCallback);
searchHandler.removeCallbacksAndMessages(null);
@@ -110,6 +115,96 @@ public class BluetoothMiScale extends BluetoothCommunication {
btAdapter.stopLeScan(scanCallback);
}
private void parseBytes(byte[] weightBytes) {
try {
float weight = 0.0f;
final byte ctrlByte = weightBytes[0];
final boolean isWeightRemoved = isBitSet(ctrlByte, 7);
final boolean isStabilized = isBitSet(ctrlByte, 5);
final boolean isLBSUnit = isBitSet(ctrlByte, 0);
final boolean isCattyUnit = isBitSet(ctrlByte, 4);
/*Log.d("GattCallback", "IsWeightRemoved: " + isBitSet(ctrlByte, 7));
Log.d("GattCallback", "6 LSB Unknown: " + isBitSet(ctrlByte, 6));
Log.d("GattCallback", "IsStabilized: " + isBitSet(ctrlByte, 5));
Log.d("GattCallback", "IsCattyOrKg: " + isBitSet(ctrlByte, 4));
Log.d("GattCallback", "3 LSB Unknown: " + isBitSet(ctrlByte, 3));
Log.d("GattCallback", "2 LSB Unknown: " + isBitSet(ctrlByte, 2));
Log.d("GattCallback", "1 LSB Unknown: " + isBitSet(ctrlByte, 1));
Log.d("GattCallback", "IsLBS: " + isBitSet(ctrlByte, 0)); */
// Only if the value is stabilized and the weight is *not* removed, the date is valid
if (isStabilized && !isWeightRemoved) {
final int year = ((weightBytes[4] & 0xFF) << 8) | (weightBytes[3] & 0xFF);
final int month = (int) weightBytes[5];
final int day = (int) weightBytes[6];
final int hours = (int) weightBytes[7];
final int min = (int) weightBytes[8];
final int sec = (int) weightBytes[9];
if (isLBSUnit || isCattyUnit) {
weight = (float) (((weightBytes[2] & 0xFF) << 8) | (weightBytes[1] & 0xFF)) / 100.0f;
} else {
weight = (float) (((weightBytes[2] & 0xFF) << 8) | (weightBytes[1] & 0xFF)) / 200.0f;
}
String date_string = year + "/" + month + "/" + day + "/" + hours + "/" + min;
Date date_time = new SimpleDateFormat("yyyy/MM/dd/HH/mm").parse(date_string);
// Is the year plausible? Check if the year is in the range of 20 years...
if (validateDate(date_time, 20)) {
ScaleData scaleBtData = new ScaleData();
scaleBtData.weight = weight;
scaleBtData.date_time = date_time;
callbackBtHandler.obtainMessage(BluetoothCommunication.BT_RETRIEVE_SCALE_DATA, scaleBtData).sendToTarget();
} else {
Log.e("BluetoothMiScale", "Invalid Mi scale weight year " + year);
}
}
} catch (ParseException e) {
callbackBtHandler.obtainMessage(BluetoothCommunication.BT_UNEXPECTED_ERROR, "Error while decoding bluetooth date string (" + e.getMessage() + ")").sendToTarget();
}
}
private boolean validateDate(Date weightDate, int range) {
Calendar currentDatePos = Calendar.getInstance();
currentDatePos.add(Calendar.YEAR, range);
Calendar currentDateNeg = Calendar.getInstance();
currentDateNeg.add(Calendar.YEAR, -range);
if (weightDate.before(currentDatePos.getTime()) && weightDate.after(currentDateNeg.getTime())) {
return true;
}
return false;
}
private boolean isBitSet(byte value, int bit) {
return (value & (1 << bit)) != 0;
}
private void printByteInHex(byte[] data) {
if (data == null) {
Log.e("BluetoothMiScale", "Data is null");
return;
}
final StringBuilder stringBuilder = new StringBuilder(data.length);
for(byte byteChar : data) {
stringBuilder.append(String.format("%02X ", byteChar));
}
Log.d("BluetoothMiScale", "Raw hex data: " + stringBuilder);
}
private BluetoothGattCallback gattCallback= new BluetoothGattCallback() {
@Override
public void onConnectionStateChange(final BluetoothGatt gatt, int status, int newState) {
@@ -309,94 +404,5 @@ public class BluetoothMiScale extends BluetoothCommunication {
}
}
private void parseBytes(byte[] weightBytes) {
try {
float weight = 0.0f;
final byte ctrlByte = weightBytes[0];
final boolean isWeightRemoved = isBitSet(ctrlByte, 7);
final boolean isStabilized = isBitSet(ctrlByte, 5);
final boolean isLBSUnit = isBitSet(ctrlByte, 0);
final boolean isCattyUnit = isBitSet(ctrlByte, 4);
/*Log.d("GattCallback", "IsWeightRemoved: " + isBitSet(ctrlByte, 7));
Log.d("GattCallback", "6 LSB Unknown: " + isBitSet(ctrlByte, 6));
Log.d("GattCallback", "IsStabilized: " + isBitSet(ctrlByte, 5));
Log.d("GattCallback", "IsCattyOrKg: " + isBitSet(ctrlByte, 4));
Log.d("GattCallback", "3 LSB Unknown: " + isBitSet(ctrlByte, 3));
Log.d("GattCallback", "2 LSB Unknown: " + isBitSet(ctrlByte, 2));
Log.d("GattCallback", "1 LSB Unknown: " + isBitSet(ctrlByte, 1));
Log.d("GattCallback", "IsLBS: " + isBitSet(ctrlByte, 0));*/
// Only if the value is stabilized and the weight is *not* removed, the date is valid
if (isStabilized && !isWeightRemoved) {
final int year = ((weightBytes[4] & 0xFF) << 8) | (weightBytes[3] & 0xFF);
final int month = (int) weightBytes[5];
final int day = (int) weightBytes[6];
final int hours = (int) weightBytes[7];
final int min = (int) weightBytes[8];
final int sec = (int) weightBytes[9];
if (isLBSUnit || isCattyUnit) {
weight = (float) (((weightBytes[2] & 0xFF) << 8) | (weightBytes[1] & 0xFF)) / 100.0f;
} else {
weight = (float) (((weightBytes[2] & 0xFF) << 8) | (weightBytes[1] & 0xFF)) / 200.0f;
}
String date_string = year + "/" + month + "/" + day + "/" + hours + "/" + min;
Date date_time = new SimpleDateFormat("yyyy/MM/dd/HH/mm").parse(date_string);
// Is the year plausible? Check if the year is in the range of 20 years...
if (validateDate(date_time, 20)) {
ScaleData scaleBtData = new ScaleData();
scaleBtData.weight = weight;
scaleBtData.date_time = date_time;
callbackBtHandler.obtainMessage(BluetoothCommunication.BT_RETRIEVE_SCALE_DATA, scaleBtData).sendToTarget();
} else {
Log.e("BluetoothMiScale", "Invalid Mi scale weight year " + year);
}
}
} catch (ParseException e) {
callbackBtHandler.obtainMessage(BluetoothCommunication.BT_UNEXPECTED_ERROR, "Error while decoding bluetooth date string (" + e.getMessage() + ")").sendToTarget();
}
}
public boolean validateDate(Date weightDate, int range) {
Calendar currentDatePos = Calendar.getInstance();
currentDatePos.add(Calendar.YEAR, range);
Calendar currentDateNeg = Calendar.getInstance();
currentDateNeg.add(Calendar.YEAR, -range);
if (weightDate.before(currentDatePos.getTime()) && weightDate.after(currentDateNeg.getTime())) {
return true;
}
return false;
}
private boolean isBitSet(byte value, int bit) {
return (value & (1 << bit)) != 0;
}
private void printByteInHex(byte[] data) {
if (data == null) {
Log.e("BluetoothMiScale", "Data is null");
return;
}
final StringBuilder stringBuilder = new StringBuilder(data.length);
for(byte byteChar : data) {
stringBuilder.append(String.format("%02X ", byteChar));
}
Log.d("BluetoothMiScale", "Raw hex data: " + stringBuilder);
}
};
}