blue-merle: restore old scrpit for SSH use

We restore from fa11fc45ca.
We know that this worked well enough the last time as we run out of time
to test new things.
Ideally, though, we manage to consolidate the SSH use and the switch use
(and the Web use) to not have different implementations of the same
functionality so that testing gets much simpler.

files/usr/bin/blue-merle

@@ -1,13 +1,135 @@
 #!/bin/sh
 
+. /lib/blue-merle/functions.sh
 
-echo "Preparing SIM Swap..."
-/usr/bin/blue-merle-switch-stage1
+if [ ! -c "/dev/ttyUSB3" ]; then
+	echo "Error: /dev/ttyUSB3 does not exist."
+	echo "Please reboot and contact the maintainer if the problem persists."
+	exit 1;
+fi
 
-echo "Replace the SIM card, then press Enter"
+echo -n "Swap SIM card and update IMEI? (Y/n): "
+read answer
+case $answer in
+	n*) answer=0;;
+	N*) answer=0;;
+	*) answer=1;;
+esac
+if [[ "$answer" -eq 0 ]]; then
+	exit 1;
+fi
+
+
+echo "Disabling the ME from both transmitting and receiving RF signals..."
+
+old_imei=$(READ_IMEI)
+old_imsi=$(READ_IMSI)
+
+answer=1
+while [[ "$answer" -eq 1 ]]; do
+	gl_modem AT AT+CFUN=4 | grep -q OK
+	if [[ $? -eq 1 ]]; then
+		echo -n "...failed. Try again? (Y/n): "
+		read answer
+		case $answer in
+			n*) answer=0;;
+			N*) answer=0;;
+			*) answer=1;;
+		esac
+		if [[ $answer -eq 0 ]]; then
+			exit 1
+		fi
+	else
+		answer=0
+	fi
+done
+
+echo -n "Please now replace the SIM card and press any key to continue. "
 read answer
 
-echo "Continuing..."
-/usr/bin/blue-merle-switch-stage2
+leak=0
 
-echo "The device will shutdown. You should change the location before booting again."
+until gl_modem AT AT+CFUN=0 | grep -q OK
+do
+	sleep 1
+	echo "CFUN=0 failed. Trying again."
+done
+
+until gl_modem AT AT+CFUN=4 | grep -q OK
+do
+	leak=1
+	echo "CFUN=4 failed. Trying again."
+done
+
+if [[ $leak -eq 1 ]]; then
+	echo
+	echo "WARNING: Reset took longer than expected."
+	echo
+fi
+
+sleep 1
+
+new_imsi=$(READ_IMSI)
+
+if [[ "$old_imsi" == "$new_imsi" ]]; then
+	echo
+	echo "WARNING: Old IMSI equals new IMSI."
+	echo
+fi
+
+echo -n "Would you like to set a random (r) or deterministic (d) IMEI? (R/d): " 
+read answer                                      
+case $answer in                                  
+        d*) answer=0;;
+        D*) answer=0;;
+        *) answer=1;;
+esac                                            
+if [[ "$answer" -eq 1 ]]; then                  
+	python3 /lib/blue-merle/imei_generate.py -r
+else
+	python3 /lib/blue-merle/imei_generate.py -d
+fi   
+
+new_imei=$(READ_IMEI)
+
+if [[ "$old_imei" == "$new_imei" ]]; then
+	echo
+	echo "WARNING: Old IMEI equals new IMEI."
+	echo
+else
+	mkdir -p /tmp/modem.1-1.2
+	echo "$new_imei" > /tmp/modem.1-1.2/modem-imei
+fi
+
+echo "You should now reset the modem or shutdown the device."
+echo "For extra privacy, you should shutdown the device and change your location."
+echo
+echo -n "Would you like to shutdown the device (s) or reset the modem (m)? (S/m): "
+read answer
+case $answer in
+	m*) answer=0;;
+	M*) answer=0;;
+	*) answer=1;;
+esac
+if [[ "$answer" -eq 1 ]]; then
+    echo '{ "msg": "Shutting down..." }' > /dev/ttyS0
+    halt -d 5
+else
+	echo "Resetting modem..."
+	until gl_modem AT AT+QPOWD | grep -q OK
+	do
+		echo "Resetting modem failed. Trying again."
+		sleep 1
+	done 
+	
+	time_start=$(date +%s)
+	until imsi=$(gl_modem AT AT+CIMI | grep -w -E "[0-9]{6,15}")
+	do
+		time_now=$(date +%s)
+		echo -ne "Waiting for reset to complete. ($(($time_now-$time_start))s/30s)\r"
+		sleep 1
+	done
+	echo
+	echo "FIN"
+fi
+