SITL: added Morse rover follow example script

libraries/SITL/examples/Morse/start_follow.sh

@@ -0,0 +1,43 @@
+#!/bin/bash
+
+# assume we start the script from the root directory
+ROOTDIR=$PWD
+ROVER=$ROOTDIR/build/sitl/bin/ardurover
+
+GCS_IP=192.168.2.48
+
+BASE_DEFAULTS="$ROOTDIR/Tools/autotest/default_params/rover.parm,$ROOTDIR/Tools/autotest/default_params/rover-skid.parm"
+
+# start up main rover in the current directory
+$ROVER --model morse-rover --uartA udpclient:$GCS_IP --uartC mcast: --defaults $BASE_DEFAULTS &
+
+# now start 2 rovers to follow the first, using
+# a separate directory for each to keep the eeprom.bin
+# and logs separate
+for i in $(seq 2); do
+    echo "Starting rover $i"
+    port1=$(expr 60000 + $i \* 2)
+    port2=$(expr 60001 + $i \* 2)
+    mkdir -p rov$i
+
+    SYSID=$(expr $i + 1)
+    FOLL_SYSID=$(expr $SYSID - 1)
+
+    # create default parameter file for the follower
+    cat <<EOF > rov$i/follow.parm
+SYSID_THISMAV $SYSID
+SERVO1_FUNCTION 73
+SERVO3_FUNCTION 74
+INITIAL_MODE 6
+MODE6 6
+FOLL_ENABLE 1
+FOLL_OFS_X -5
+FOLL_OFS_TYPE 1
+FOLL_SYSID $FOLL_SYSID
+FOLL_DIST_MAX 1000
+EOF
+    pushd rov$i
+    $ROVER --model "morse-rover:127.0.0.1:$port1:$port2" --uartA tcp:0 --uartC mcast: --instance $i --defaults $BASE_DEFAULTS,follow.parm &
+    popd
+done
+wait