Linux gets 4G signal strength __linux

I got a lot of information, but I didn't find it. Get 4G signal Strength application code

There's no way, I can only write it myself.

First you need to know what the AT command is. This can refer to the following connection:

Https://www.cnblogs.com/yuweifeng/p/5587473.html

If the 4G device is running normally at the Terminal Input command will get the device current signal

Command:cat/dev/ttyusb2&

Echo-e "at+csq\r\n" >/DEV/TTYUSB2

Get:

At+csq
+csq:28,99
Ok
Aat+csq
+csq:28,99

28 is Rssi converted into a signal lattice reference article http://velep.com/archives/1147.html

I guess I'll just take a look. The following is the code is written in Qt, common discussion, welcome message

void Mainwindow::getcursignalstrenght (void) {printf ("============geting cursignalstrenght============\n");
	
    int sentatcount = 100; if (ec20check==1) {System ("CAT/DEV/TTYUSB2 |
		
		grep \ ' csq\ ' > signalstrength& ');
			while (sentatcount--) {printf ("============launch at command============\n");
			System ("ECHO-E \" at+csq\\r\\n\ ">/dev/ttyusb2");
			printf ("Echo-e \" at+csq\\r\\n\ ">/dev/ttyusb2\n");
			
			Usleep (1000);
			
			Qfile tempfile ("Signalstrength"); if (!tempfile.open (qiodevice::readonly |
			Qiodevice::text)) {qdebug () << "open signalstrength fail";
				else {Qtextstream templinefile (&tempfile);
				QString Templine;
				Templine = Templinefile.readline (). simplified ();
				Tempfile.close (); if (!templine.isempty ()) {printf ("============get data from temp file, say OH HO!!!!
					============\n ");
				Break
				else {printf ("============fuck, There no useful Data yet============\n");	Continue wile do Nothine}} system ("grep \ +csq:\ ' signalstrength > tempfilesignal");

		Qfile signalfile ("tempfilesignal"); if (!signalfile.open (qiodevice::readonly |
 			Qiodevice::text)) {signalstrenght = 0;
		Qdebug () << "open tempfilesignal fail";
			else {Qtextstream infile (&signalfile);
			QString Line;
			line = Infile.readline (). simplified ();
	
			Signalfile.close ();
				if (!line.isempty ()) {//--------------------------QString linedate;
				QString Rssi;  
				BOOL OK;
				Rssi = Line.mid (6,2);
				Qdebug () << "signal number is-tmpchr>=" <<rssi;
				printf ("Tmp.toint (&ok,10) is->%d\n", Rssi.toint (&ok,10));
				
				int Signaltrans =-113 + (2 * rssi.toint (&ok,10));

				printf ("Signaltrans is->%d\n", Signaltrans);
				if (Signaltrans >-91) {signalstrenght = 5;
				else if (Signaltrans <= -91 && signaltrans>-101) {signalstrenght = 4; }
				else if (Signaltrans <= -101 && signaltrans>-103) {signalstrenght = 3;
				else if (Signaltrans <= -103 && signaltrans>-107) {signalstrenght = 2;
				else if (Signaltrans <= -107 && signaltrans>-113) {signalstrenght = 1;
				else {//no signal signalstrenght = 0;
			printf ("=======get signalstrenght success.= signalstrenght is%d=======\n", signalstrenght);
				else {printf ("=======get signalstrenght failed...==set signalstrenght zero=======\n");
			signalstrenght = 0;
} System ("rm tempfilesignal-rf");
 }