Introduce a bash script to test PRS using estimated ToA

Set RFsim (DL) distance and use PRS to estimate the new distance. This
is verified by comparing the distance set in RFsim with the distance
reported through ToA estimation at the UE.

Note that since RFsim telnet output is asynchronous (it uses a queue
internally), we use grep --max-count 1 to wait for the matching line,
together with ncat --idle 0.3 to keep ncat open for some time. The
--max-count option will terminate grep after the first occurrence. For
this to work reliably, we need to use grep <(echo | ncat) as opposod to
simply echo | ncat | grep, as the latter does not seem to reliably
make grep exit after the occurrence.
Co-authored-by: Robert Schmidt <robert.schmidt@openairinterface.org>

ci-scripts/scripts/set-and-verify-distance-prs.sh

+#!/bin/bash
+
+die() { echo -e "$@"; exit 1; }
+
+[[ -z "$1" ]] && die "Usage: $0 <distance_in_meters>"
+
+IP=192.168.71.150
+PORT=8091
+distance=$1
+
+set_and_verify_distance() {
+  local distance=$1
+  echo "Testing PRS ToA estimation for distance: $distance m"
+
+  # it sems that grep returns immediately with this syntax, but not echo | ncat | grep
+  # so prefer this to receive new distance immediately. We use --idle to keep
+  # ncat open for some additional time
+  local setdist_resp="$(grep --max-count 1 new_offset <(echo rfsimu setdistance rfsimu_channel_enB0 $distance | ncat --idle 1 ${IP} ${PORT}))"
+  echo "> response: ${setdist_resp}"
+  local gettoa_resp="$(echo ciUE get_max_dl_toa | ncat ${IP} ${PORT} | grep "UE max PRS DL ToA")"
+  echo "> response: ${gettoa_resp}"
+
+  [[ "$setdist_resp" =~ new_offset\ ([0-9]+) ]] || die "Set ToA extraction failed for distance: $distance m\nLOG: $setdist_resp"
+  local set_toa="${BASH_REMATCH[1]}"
+  
+  [[ "$gettoa_resp" =~ UE\ max\ PRS\ DL\ ToA\ ([0-9]+) ]] || die "Estimated ToA extraction failed for distance: $distance m\nLOG: $gettoa_resp"
+  local est_toa="${BASH_REMATCH[1]}"
+  
+  [[ $set_toa == $est_toa ]] || die "PRS FAILURE for distance: $distance m\nActual ToA = $set_toa, Estimated ToA = $est_toa"
+  
+  echo "PRS SUCCESS for distance: $distance m"
+}
+
+# Set distance to 0 initially and then set the actual distance
+sleep 4
+set_and_verify_distance 0
+
+sleep 4
+set_and_verify_distance $distance