reduce wifi reconnection time after deep sleep #150

Makefile

@@ -44,8 +44,9 @@ install: $(PROGRAMS)
 
 	install -D -m 0644 -t $(DESTDIR)$(PREFIX)/share/applications/ configs/xdg/mimeapps.list
 
-	mkdir -p $(PREFIX)/etc/NetworkManager/dispatcher.d
-	cp configs/networkmanager/updatestatusbar.sh $(PREFIX)/etc/NetworkManager/dispatcher.d/10-updatestatusbar.sh
+	mkdir -p $(DESTDIR)/etc/NetworkManager/dispatcher.d
+	install -D -m 0755 -T configs/networkmanager/updatestatusbar.sh $(DESTDIR)/etc/NetworkManager/dispatcher.d/10-updatestatusbar.sh
+	install -D -m 0755 -T configs/networkmanager/resetscaninterval.sh $(DESTDIR)/etc/NetworkManager/dispatcher.d/20-resetscaninterval.sh
 
 	# Bin
 	install -D -t $(DESTDIR)$(PREFIX)/bin scripts/*/*

configs/networkmanager/resetscaninterval.sh

@@ -0,0 +1,2 @@
+#!/bin/sh
+sxmo_resetscaninterval.sh

programs/sxmo_screenlock.c

@@ -375,10 +375,14 @@ syncstate()
 			writefile(powerstatefile, "mem");
 			//---- program blocks here due to sleep ----- //
 			// Just woke up again
+			fprintf(stderr, "Woke up\n");
 			fprintf(stderr, "Resetting usb connection to the modem\n");
 			writefile("/sys/bus/usb/drivers/usb/unbind", "3-1");
 			writefile("/sys/bus/usb/drivers/usb/bind", "3-1");
-			fprintf(stderr, "Woke up\n");
+			fprintf(stderr, "Lower scan interval for quicker reconnection to wireless network\n");
+			writefile("/sys/module/8723cs/parameters/rtw_scan_interval_thr", "1200"); //ms
+			//^-- this will be undone again by a networkmanager hook after connection has been established
+			//    or by a delayed script if no connection can be established after a while (to conserve battery)
 			if (waketime > 0) {
 				rtcresult = checkrtcwake();
 			} else {

scripts/core/sxmo_postwake.sh

@@ -4,6 +4,8 @@
 
 sxmo_statusbarupdate.sh
 
+(sleep 15 && sxmo_resetscaninterval.sh) &
+
 if [ -x "$XDG_CONFIG_HOME/sxmo/hooks/postwake" ]; then
 	"$XDG_CONFIG_HOME/sxmo/hooks/postwake"
 fi

scripts/core/sxmo_resetscaninterval.sh

@@ -0,0 +1,11 @@
+#!/bin/sh
+
+# this script resets the wireless scan interval (value is in ms)
+# it is invoked with a delay after waking from sleep
+# to prevent the scan interval from being too quick, and thus
+# too battery consuming, whilst no networks are found
+
+# the kernel parameter must be writable for the user
+# or this script must have the setsuid bit set!
+
+echo 16000 > /sys/module/8723cs/parameters/rtw_scan_interval_thr