[FIX] For wifi connection dropping too easily/often

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gtg465x

Inactive Recognized Developer
Jun 16, 2008
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The ROM you wish to apply the fix to must be deodexed so that framework.jar can be modified.

1) Add the line "rssi_offset=-20" to /system/etc/calibration.

2) Extract framework.jar and pull out classes.dex.

3) Download baksmali and smali and put them in the same folder as classes.dex.

4) Open a command prompt, cd to the folder, and run the following command to decompile classes.dex:

java -jar baksmali-1.3.0.jar -o classout/ classes.dex

The decompiled code will be in a new folder named classout.

5) Open /classout/android/net/wifi/WifiManager.smali with a text editor. I use Notepad++. There are 7 RSSI values in this file that need to be edited. Two are defines in the beginning of the file (MIN_RSSI and MAX_RSSI) and five more are in the calculateSignalLevel method. They need to be adjusted by the same amount you set in the calibration file. Note that the values in this file are in HEX. Convert them to decimal, subtract 20 (or whatever value you set in the calibration file), and then convert the result back to HEX.

6) Delete the original classes.dex file and recompile using the following command:

java -Xmx512M -jar smali-1.3.0.jar classout/ -o classes.dex

7) Use something like 7-zip file manager to drop your new classes.dex into framework.jar.
 
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kylon

Senior Member
Dec 17, 2010
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-.- read the first post

Sent from my HTC Desire S using XDA Premium App
 

kylon

Senior Member
Dec 17, 2010
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The ROM you wish to apply the fix to must be deodexed so that framework.jar can be modified.

1) Add the line "rssi_offset=-20" to /system/etc/calibration.

2) Extract framework.jar and pull out classes.dex.

3) Download baksmali and smali and put them in the same folder as classes.dex.

4) Open a command prompt, cd to the folder, and run the following command to decompile classes.dex:

java -jar baksmali-1.3.0.jar -o classout/ classes.dex

The decompiled code will be in a new folder named classout.

5) Open /classout/android/net/wifi/WifiManager.smali with a text editor. I use Notepad++. There are 7 RSSI values in this file that need to be edited. Two are defines in the beginning of the file (MIN_RSSI and MAX_RSSI) and five more are in the calculateSignalLevel method. They need to be adjusted by the same amount you set in the calibration file. Note that the values in this file are in HEX. Convert them to decimal, subtract 20 (or whatever value you set in the calibration file), and then convert the result back to HEX.

6) Delete the original classes.dex file and recompile using the following command:

java -Xmx512M -jar smali-1.3.0.jar classout/ -o classes.dex

7) Use something like 7-zip file manager to drop your new classes.dex into framework.jar.

thanks for the help,but now we have 2 signal method in our wifimanager with about 8 values
anyway,why dx doens t work?
 

steelbeans

Senior Member
Nov 25, 2010
426
34
Bury St. Edmunds
Sorry to dig up a mega old thread, but this fix looks pretty handy!

Will it work on the ROMS out today? I see theres 1.37 and 1.4x editions (the RUUs) - so wouldnt know which one to use for ICS rom for example..?

Cheers
 

kylon

Senior Member
Dec 17, 2010
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Sorry to dig up a mega old thread, but this fix looks pretty handy!

Will it work on the ROMS out today? I see theres 1.37 and 1.4x editions (the RUUs) - so wouldnt know which one to use for ICS rom for example..?

Cheers

Noone
Open the calibration file
Edit rssi_offset with your favorite value
Now to fix the signal bars you need to edit your framework-res
(The guide in this topic can t help you so much,because ours framework are different)

Sent from my HTC Desire S using xda premium
 

steelbeans

Senior Member
Nov 25, 2010
426
34
Bury St. Edmunds
Noone
Open the calibration file
Edit rssi_offset with your favorite value
Now to fix the signal bars you need to edit your framework-res
(The guide in this topic can t help you so much,because ours framework are different)

Sent from my HTC Desire S using xda premium

Ok wasnt expecting that haha. Think i'm going to need some more guidance, so I Open the calibration file from one of these zips? or the one in my /system (where do i find it?). (Edit- found it in my /sys/calibration - you said favourite value? haha. Do you mean i put instead of 0, i put -108?

Thanks

Noob here, sorry.
 
Last edited:

kylon

Senior Member
Dec 17, 2010
2,615
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System/etc
Look for rssi_etc... And change the value

Sent from my HTC Desire S using xda premium
 
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kylon

Senior Member
Dec 17, 2010
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Try a value
It is not the same for everyone

and remenber the simbol -
-180

Sent from my HTC Desire S using xda premium
 
Last edited:
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steelbeans

Senior Member
Nov 25, 2010
426
34
Bury St. Edmunds
It doesnt seem to save.. I'm using ES file explorer, mounting sys as write, then going into the file using text editor but it wont let me save it!!

It just stays like: rssi_offset=0 after I close it :(
 

steelbeans

Senior Member
Nov 25, 2010
426
34
Bury St. Edmunds
I can confirm it kinda works - obviously showing the minimum amount of signal bars cos i havent changed the framework (dont need to to be honest).

Looks like -20 is the figure used in the flashable zip here, so i'm using that and seems to be fine.

Also can confirm that you can ONLY change the calibration file with Root Explorer when mounting as R/W, no other file manager that ive used works (even with root access and r/w system etc etc).


Thanks for the help
Beans
 

Lodberg

Senior Member
Jul 13, 2011
204
68
I can confirm it kinda works - obviously showing the minimum amount of signal bars cos i havent changed the framework (dont need to to be honest).

Looks like -20 is the figure used in the flashable zip here, so i'm using that and seems to be fine.

Also can confirm that you can ONLY change the calibration file with Root Explorer when mounting as R/W, no other file manager that ive used works (even with root access and r/w system etc etc).


Thanks for the help
Beans

I would be very glad if you or someone else can make a little "how to flash this thing". I ended up in boot loop when trying.

Regards,
Lodberg
 

kylon

Senior Member
Dec 17, 2010
2,615
2,028
@ALL

DON T FLASH ANY ZIPS IN THE OP
Why don t read prev. post?

Sent from my HTC Desire S using xda premium
 

lowrider82

Senior Member
Jan 26, 2012
709
49
Hi Guys, can someone help? I can't find any file named calibration or config in Sys folder or in system/etc folder...I am running miui 2.4.20

Thanks in advance
 

kylon

Senior Member
Dec 17, 2010
2,615
2,028
Maybe miui uses a different path

Sent from my HTC Desire S with xda premium
 

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  • 10
    I don't even have this phone, but I'm tired of hearing you guys complain about your wifi dropping :p. HTC programmed the Desire S to drop wifi connections if the signal falls below -88db. I'm not sure why they did that because -88db is a perfectly usable signal. With this fix, your wifi connection won't drop until the signal falls below -108db.

    You need to be running a custom deodexed ROM to apply this fix.

    Flash through Clockwork Recovery.

    Let me know if it works for you!


    If you appreciate my work, donations of any amount are very much appreciated.
    2
    [PATCH] framework.jar for altering WiFi RSSI values in ICS

    /*
    * I am not responsible for bricked devices, dead SD cards,
    * thermonuclear war, or you getting fired because the alarm app failed. Please
    * do some research if you have any concerns before flashing it!
    * YOU are choosing to make these modifications, and if
    * you point the finger at me for messing up your device, I will laugh at you.
    */


    A big thanks to gtg465x, kylon and others in the forum for explaining things in posts. It's their work mostly and not mine.

    I'm writing this here just in case someone needs the info..

    Since I had a problem with the reception of WiFi signal in a Desire S and I've been searching the forum for many days to find a solution to this that I got no responce I decided to search for the framework.jar file patch that has to be done with the /etc/calibration file change to the value of rssi_offset so that Desire S won't drop the connection so easily. Tried also to contact gtg465x but I guess he's busy.

    This was done to ICE_DS 6.5 ROM

    The patch goes as this:
    (1. I am not a developer (used to code, not in android though)
    2. I modified the values only by -10 dBm just for test you can change to -20 if you like
    3. feel free to correct my wrongs)



    gtg465x describes very nicely here what needs to be done http://xdaforums.com/showthread.php?p=25174730 but this is for GB ROM
    Read carefully to edit your /etc/calibration file. In that post it's changed to -20, in my test to -10

    but ICE_DS 6.5 is a ICS ROM

    and the code in WiFiManager.smali is as follows
    (the sections that need to be edited)
    Code:
    .field private static final MAX_RSSI:I = [COLOR="Red"]-0x37[/COLOR] [COLOR="Blue"]#changed to -0x41[/COLOR]
    
    .field private static final MIN_RSSI:I = [COLOR="red"]-0x64[/COLOR] [COLOR="Blue"]#changed to -0x6e[/COLOR]

    Code:
    .method public static calculateSignalLevel(II)I
        .registers 9
        .parameter "rssi"
        .parameter "numLevels"
    
        .prologue
        const/4 v6, 0x5
    
        const/16 v5,[COLOR="Red"] -0x46[/COLOR] [COLOR="Blue"]#changed to -0x50[/COLOR]
    
        const/16 v4, [COLOR="red"]-0x50[/COLOR] [COLOR="Blue"]#changed to -0x5a[/COLOR]
    
        .line 963
        const/4 v1, 0x0
    
        .line 964
        .local v1, level:I
        const/4 v3, 0x4
    
        if-eq p1, v3, :cond_b
    
        if-ne p1, v6, :cond_23
    
        .line 965
        :cond_b
        if-lt p0, v5, :cond_13
    
        .line 966
        const/4 v1, 0x3
    
        .line 974
        :goto_e
        if-ne p1, v6, :cond_12
    
        add-int/lit8 v1, v1, 0x1
    
        .line 986
        :cond_12
        :goto_12
        return v1
    
        .line 967
        :cond_13
        if-ge p0, v5, :cond_19
    
        if-lt p0, v4, :cond_19
    
        .line 968
        const/4 v1, 0x2
    
        goto :goto_e
    
        .line 969
        :cond_19
        if-ge p0, v4, :cond_21
    
        const/16 v3, [COLOR="red"]-0x55[/COLOR] [COLOR="Blue"]#changed to -0x5f[/COLOR]
    
        if-lt p0, v3, :cond_21
    
        .line 970
        const/4 v1, 0x1
    
        goto :goto_e
    
        .line 972
        :cond_21
        const/4 v1, 0x0
    
        goto :goto_e
    
        .line 976
        :cond_23
        const/16 v3, [COLOR="red"]-0x64[/COLOR] [COLOR="Blue"]#changed to -0x6e[/COLOR]
    
        if-gt p0, v3, :cond_29
    
        .line 977
        const/4 v1, 0x0
    
        goto :goto_12
    
        .line 978
        :cond_29
        const/16 v3, [COLOR="red"]-0x37[/COLOR] [COLOR="Blue"]#changed to -0x41[/COLOR]
    
        if-lt p0, v3, :cond_30
    
        .line 979
        add-int/lit8 v1, p1, -0x1
    
        goto :goto_12
    
        .line 981
        :cond_30
        const/high16 v0, 0x4234
    
        .line 982
        .local v0, inputRange:F
        add-int/lit8 v3, p1, -0x1
    
        int-to-float v2, v3
    
        .line 983
        .local v2, outputRange:F
        add-int/lit8 v3, p0, 0x64
    
        int-to-float v3, v3
    
        mul-float/2addr v3, v2
    
        div-float/2addr v3, v0
    
        float-to-int v1, v3
    
        goto :goto_12
    .end method


    this translates to java as (the original values)
    Code:
     public static int calculateSignalLevel(int paramInt1, int paramInt2)
      {
        if ((paramInt2 == 4) || (paramInt2 == 5))
        {
          int i;
          if (paramInt1 >= -70)
            i = 3;
          for (;;)
          {
            if (paramInt2 == 5)
              i++;
            return i;
            if ((paramInt1 < -70) && (paramInt1 >= -80))
              i = 2; else if ((paramInt1 < -80) && (paramInt1 >= -85))
              i = 1; else
              i = 0;
          }
        }
        if (paramInt1 <= -100)
          return 0;
        if (paramInt1 >= -55)
          return paramInt2 - 1;
        return (int)((paramInt2 - 1) * (paramInt1 + 100) / 45.0F);
      }


    There is also another section in WiFiManager.smali called calculateSignalLevel(III)I
    Code:
    .method public static calculateSignalLevel(III)I
        .registers 7
        .parameter "rssi"
        .parameter "numLevels"
        .parameter "frequency"
    
        .prologue
        const/16 v3, -0x41
    
        const/16 v2, -0x46
    
        .line 2027
        const/16 v1, 0x1324
    
        if-le p2, v1, :cond_22
    
        .line 2028
        const/4 v0, 0x0
    
        .line 2029
        .local v0, level:I
        if-lt p0, v3, :cond_12
    
        .line 2030
        const/4 v0, 0x3
    
        .line 2038
        :goto_c
        const/4 v1, 0x5
    
        if-ne p1, v1, :cond_11
    
        add-int/lit8 v0, v0, 0x1
    
        .line 2041
        .end local v0           #level:I
        :cond_11
        :goto_11
        return v0
    
        .line 2031
        .restart local v0       #level:I
        :cond_12
        if-ge p0, v3, :cond_18
    
        if-lt p0, v2, :cond_18
    
        .line 2032
        const/4 v0, 0x2
    
        goto :goto_c
    
        .line 2033
        :cond_18
        if-ge p0, v2, :cond_20
    
        const/16 v1, -0x4b
    
        if-lt p0, v1, :cond_20
    
        .line 2034
        const/4 v0, 0x1
    
        goto :goto_c
    
        .line 2036
        :cond_20
        const/4 v0, 0x0
    
        goto :goto_c
    
        .line 2041
        .end local v0           #level:I
        :cond_22
        invoke-static {p0, p1}, Landroid/net/wifi/WifiManager;->calculateSignalLevel(II)I
    
        move-result v0
    
        goto :goto_11
    .end method

    which reads as:

    Code:
      public static int calculateSignalLevel(int paramInt1, int paramInt2, int paramInt3)
      {
        if (paramInt3 > 4900)
        {
          int i;
          if (paramInt1 >= -65)
            i = 3;
          for (;;)
          {
            if (paramInt2 == 5)
              i++;
            return i;
            if ((paramInt1 < -65) && (paramInt1 >= -70))
              i = 2; else if ((paramInt1 < -70) && (paramInt1 >= -75))
              i = 1; else
              i = 0;
          }
        }
        return calculateSignalLevel(paramInt1, paramInt2);
      }

    but I have the believe (which I may well be wrong) that has to do something about WiMax (if (paramInt3 > 4900)) so I didn't touch that.
    2
    Ok, checked the file and it's possible but a bit hard using init.rc.
    Another way, download the attached file, extract it, open the extracted file and replace the PATHTOCALIBRATIONFILE with the correct path inclusive filename, afterwards copy it to your /etc/init.d folder and set the correct permissions (r-xr-xr-x or 555 or everyone execute and read), this will write at startup the fitting values to the calibration file.
    2
    Grab Root Browser its free

    Sent from my Desire S using XDA
    1
    Small update... noticed that I didn't set the permissions right on one of the files. May want to grab v2.

    On another note, where is everyone? Dev community for this phone needs to wake up!