code to fix Cydia network problem on iOS 11

gistfile1.txt

//
//  main.c
//  NetworkFixer
//
//  Created by mac on 2018/11/24.
//  Copyright (c) 2018 ___ORGANIZATIONNAME___. All rights reserved.
//

#include <stdio.h>
#import <Foundation/Foundation.h>

// link to /System/Library/PrivateFrameworks/Preferences.framework/Preferences

// entitlements used:
/*
 <?xml version="1.0" encoding="UTF-8"?>
 <!DOCTYPE plist PUBLIC "-//Apple//DTD PLIST 1.0//EN" "http://www.apple.com/DTDs/PropertyList-1.0.dtd">
 <plist version="1.0">
     <dict>
         <key>com.apple.CommCenter.fine-grained</key>
         <array>
             <string>cellular-plan</string>
             <string>data-usage</string>
             <string>data-allowed-write</string>
             <string>preferences-write</string>
         </array>
         <key>platform-application</key>
         <true/>
     </dict>
 </plist>
  */

@interface AppWirelessDataUsageManager : NSObject
+ (void)setAppCellularDataEnabled:(NSNumber*)arg1 forBundleIdentifier:(NSString*)arg2 completionHandler:(id /* block */)arg3;
+ (void)setAppWirelessDataOption:(NSNumber*)arg1 forBundleIdentifier:(NSString*)arg2 completionHandler:(id /* block */)arg3;
@end

int main (int argc, const char * argv[])
{
    NSString *cydiaBundleId = [NSString stringWithUTF8String:"com.saurik.Cydia"];
    [AppWirelessDataUsageManager setAppWirelessDataOption:[NSNumber numberWithInt:3] 
                                      forBundleIdentifier:cydiaBundleId completionHandler:nil];
    [AppWirelessDataUsageManager setAppCellularDataEnabled:[NSNumber numberWithInt:1] 
                                       forBundleIdentifier:cydiaBundleId completionHandler:nil];
	return 0;
}

Note the entitlements needed:

 <?xml version="1.0" encoding="UTF-8"?>
 <!DOCTYPE plist PUBLIC "-//Apple//DTD PLIST 1.0//EN" "http://www.apple.com/DTDs/PropertyList-1.0.dtd">
 <plist version="1.0">
     <dict>
         <key>com.apple.CommCenter.fine-grained</key>
         <array>
             <string>cellular-plan</string>
             <string>data-usage</string>
             <string>data-allowed-write</string>
             <string>preferences-write</string>
         </array>
         <key>platform-application</key>
         <true/>
     </dict>
 </plist>