Develop Reference

TrafficStats API's getMobileRxBytes() and getMobileTxBytes() not working properly

The issue is known: when wifi is up, TrafficStats.getMobileRxBytes() and getMobileTxBytes() return 0 since Lollipop (https://issuetracker.google.com/issues/37009612).
I found a workaround ignoring zero values, except that on some devices (e.g Samsung 5G), when on wifi,  we get non-0 values. It brings only rmnet1 interface value traffic (rmnet1 is for VoLTE, rmnet0 for normal data).
1/ why only on Samsung devices? while it seems to be handled by Android OS
2/ another observation still on Samsung 5G devices (at least on Samsung S20): when wifi is down, cell counter (all cell traffic since boot: rmnet0 + rmnet1) is inconsistent, sometime we get a value V1, sometime a value V2 (different from V1)
A similar experience?

I haven't used 5G enabled devices, but as of i know, using NetworkStats.Bucket's object we can query for RxBytes and TxBytes with the help of querySummaryForDevice() which takes around 4 parameters
Connectivity(Mobile data, WIFI)
SubscriberID(here for OS 10+ we need to pass null and for previous versions we need to
pass subscriber id using TELEPHONY_SERVICE).
Starttime
Endtime.
you can get subscriberID using below code
private String getSubscriberId(Context context, int networkType) {
String deviceUniqueIdentifier = null;
if (ConnectivityManager.TYPE_MOBILE == networkType) {
TelephonyManager tm = (TelephonyManager) context.getSystemService(Context.TELEPHONY_SERVICE);
return tm.getSubscriberId();
}
return "";
}
This worked for me to get the RxBytes and TxBytes.

GSM RSSI and LTE RSSI and RSRP

I am looking to create an app that gets information about the phones connection to the cellular network.
My understanding is that RSSI is a measure of cellular signal with GSM and RSRP is a good measure for LTE.
To keep it consistent, is it possible to get a RSSI measure for LTE?
I am confused about what classes to use to get some of this information. At the moment, I am using the phone state listener which gives me a SignalStrength object. Using this object, I can call the two string method that provides me the following information when i split it. I am a little confused on what some of this means.
String ssignal = signalStrength.toString();
String[] parts = ssignal.split(" ");
The parts[] array will then contain these elements:
part[0] = "Signalstrength:" _ignore this, it's just the title_
parts[1] = GsmSignalStrength
parts[2] = GsmBitErrorRate
parts[3] = CdmaDbm
parts[4] = CdmaEcio
parts[5] = EvdoDbm
parts[6] = EvdoEcio
parts[7] = EvdoSnr
parts[8] = LteSignalStrength
parts[9] = LteRsrp
parts[10] = LteRsrq
parts[11] = LteRssnr
parts[12] = LteCqi
parts[13] = gsm|lte|cdma
parts[14] = _not really sure what this number is_
What is part 8 providing? RSSI?
Also, when you look at the signal strength in the android settings, it gives you the RSSI for GSM. When connected to LTE, is it giving us the RSRP or RSSI? It seems its providing RSRP.
My understanding is that part[1] provides the RSSI when connected on GSM. However, i am unsure, and interested about, part[2] (what is the rate measured against? what unit of time), part[8] (what does it measure exactly?), part[10] and part [11](what unit is it measured in and what is the unit range)
I understand this thread is all over the place. Hopefully it makes a little bit of sense and someone can clear something up.
Cheers guys!

To put it simply, RSSI and RSRP are signal level measurements for GSM and LTE, respectively. They are not exactly the same, because GSM and LTE are very different technologies. However, they both indicate the same type of information. RSRP holds no meaning in GSM and RSSI means something different in LTE.
This question may be worth reading:
How to get LTE signal strength in Android?
Most of what you are looking for, I was able to find here: https://developer.android.com/reference/packages.html
GsmSignalStrength - GSM Signal Strength, valid values are (0-31, 99) as defined in TS 27.007 8.5
GsmBitErrorRate - GSM bit error rate (0-7, 99) as defined in TS 27.007 8.5
CdmaDbm - CDMA RSSI value in dBm
CdmaEcio - CDMA Ec/Io value in dB*10
EvdoDbm - EVDO RSSI value in dBm
EvdoEcio - EVDO Ec/Io value in dB*10
EvdoSnr - Signal to noise ratio. Valid values are 0-8. 8 is the highest.
I could not locate the following, but here is what I suspect:
LteSignalStrength - LTE Signal Strength in ASU (0-31, 99)
LteRsrp - LTE RSRP value in dBm
LteRssnr - LTE SINR value in dB
LteCqi - LTE CQI (no units)
gsm|lte|cdma - Network type

Pic16F688 has no stable readings via buletooth

I have spent much time trying to find out where is my mistakes while Im flashing the PIC16F688. The Pic has successfully flashed using PicKit2. Im using the Pic to convert analog pressure sensor to digital output and sending the data via Bluetooth, but the Bluetooth is not receiving stable numbers of data. The data is consist of 4 character decimal number that is between 0 and 1023.
The problem is that the Bluetooth can't wait at specific number and keep reading it, instead, it is reading the 4 digits in random.
I think my mistake is within the configuration of internal oscillator.
I'm attaching my code, the code is written to configure the flexiforce sensor circuit that outputs analog voltage up to 5v, and then the pic duty is to convert it to digital as I mentioned above.
it might be my wiring is not correct, please If you could help out with this one
and what configuration "at edit project" do I need to choose for Mikro PRO software?
I used "Bluetooth terminal" app to see my data asynchronous from Bluetooth.
Thank you.
char *temp = "0000";
unsigned int adc_value;
char uart_rd; int i;
void main()
{
OSCCON = 0x77;
ANSEL = 0b00000100;
CMCON0 = 0X07;
TRISA = 0b00001100;
UART1_Init(9600);
Delay_ms(100);
while (1)
{
adc_value = ADC_Read(2);
temp[0] = adc_value/1000+48;
temp[1] = (adc_value/100)%10+48;
temp[2] = (adc_value/10)%10+48;
temp[3] = adc_value%10+48;
for (i=0;i<4; i++)
UART1_Write(temp[i]);
UART1_Write(13);
Delay_ms(1000);
}
}

You can use itoa function to convert ADC integer value to characters for sending over UART. If there is error in calculation then you wont get appropriate value. Below code snippet for your reference :
while (1)
{
adc_value = ADC_Read(2);
itoa(adc_value, temp, 10);
for (i=0;i<4; i++)
UART1_Write(temp[i]);
UART1_Write(13);
Delay_ms(1000);
}
Please check Baud Rate you have configured at both ends is same or not. If baudrate mismatches then you will get Random value at Bluetooth Terminal where you are reading values.

What i would suggest, if you have a logic analyser, hook it up. If you don't recalculate your oscillator speed with the datasheet. It could just be that the internal oscillator is not accurate enough. What also works, is to write a function in assembly that waits a known time (by copy-pasting a lot of NOPs and using this to blink a led. Then start a stopwatch and count, say, 100 blinks. This is what i used to do before i had a logic analyser. (They are quite cheep on ebay).

Android MCC / MNC display wrong value

So I was using the method described in https://stackoverflow.com/a/890945/761670 to check for MCC & MCC in my app.
I got MCC=134 & MNC=38, but this is totally NOT what I was expecting bein in the US with a Cricket Wireless phone...
Looking # http://en.wikipedia.org/wiki/Mobile_Network_Code#U, I expected 310 & 16 - am I doing something wrong or is the Wiki page wrong?
Thanks,

This is an old question, but the answer would have helped me - finally found it.
In the SO question you reference, the code gets the "tower operator" not the SIM operator.
So this line:
String networkOperator = tel.getNetworkOperator();
Should be this:
String networkOperator = tel.getSimOperator();
because it's likely Cricket (in your case) isn't the tower operator...

get SensorValues from Arduino ADK

I'am working with arduino and ADK und I have problems to get Information from Arduino-Sensors. At the moment I can send Information from Phone to control LED or servos.... . But it is impossible for me to send Data via acc.write(msg,3) to smarthphone. I'am using this example Dev-O-Rama and try to extend this example to get sensor data(without success). To get sensordata I'am using code from ADK example. Everytime when I try to send data from arduino with: acc.write(msg,3) it seems everything freezing. Have someone a working "little" example or a hint what can cause this behavior?
LG Marcel

I figure it's the Android application that's freezing?
Try using the USBControl library in my project
The arduino write code is very simple:
//Batt update, 0.1 Hz loop
if (acc.isConnected() && millis()-timer_batt >= 1000/BATT_FREQ) {
timer_batt = millis();
//Serial.print("b");
msg[0] = SYNC;
msg[1] = BATTERY_LEVEL;
msg[2] = getBatt();
acc.write(msg, 3);
}
Make sure you're limiting the writing frequency, and reading quickly enough on both sides. There's a strange behaviour where the connection will appear to hang if there's too much data being buffered.

It's hard to say what to do without knowing what kind of data you are sending. Basically you have to make sure use the acc.write() method with the correct parameters. The first one is the byte array itself and the second one is the number of bytes in the array. So if your byte array is 5 bytes in size you need to call it like that: acc.write(msg, 5).
It is even better to make it more dynamic by using the sizeof Arduino function:
acc.write(msg, sizeof(msg));