dwm-plugins: fix vibration test, AT debug channel, and Close softkey leak

overlay/rootfs/usr/libexec/msm-modem-uim-selection

@@ -504,57 +504,50 @@ case "$cmd" in
       echo "ERROR: Empty AT command"
       exit 1
     fi
-    run_at_dev() {
-      dev="$1"
-      [ -c "$dev" ] || return 1
-      out="$(timeout 2 awk -v dev="$dev" -v cmd="$at_cmd" '
-        BEGIN {
-          sys = "stty -F " dev " raw -echo 115200 min 0 time 2 2>/dev/null"
-          system(sys)
-          printf "%s\r\n", cmd > dev
-          close(dev)
-        }
-      ' 2>/dev/null || true)"
-      return 0
-    }
     resp=""
-    for candidate in "$port" wwan0at1 wwan0at0; do
+    for candidate in "$port" /dev/wwan0at1 /dev/wwan0at0; do
       case "$candidate" in
         wwan0at0|wwan0at1)
           dev="/dev/$candidate"
-          if [ -c "$dev" ]; then
-            resp="$(timeout 2 sh -c '
-              dev="$1"
-              cmd="$2"
-              stty -F "$dev" raw -echo 115200 min 0 time 2 2>/dev/null || true
-              exec 3<>"$dev"
-              dd bs=256 count=4 status=none <&3 >/dev/null 2>&1 || true
-              printf "%s\r\n" "$cmd" >&3
-              lines=""
-              i=0
-              while [ "$i" -lt 8 ]; do
-                chunk="$(dd bs=512 count=1 status=none <&3 2>/dev/null | tr -d "\r" || true)"
-                if [ -n "$chunk" ]; then
-                  lines="${lines}${chunk}"
-                  case "$lines" in
-                    *OK*|*ERROR*)
-                      break
-                      ;;
-                  esac
-                fi
-                i=$((i + 1))
-              done
-              exec 3>&-
-              printf "%s\n" "$lines"
-            ' _ "$dev" "$at_cmd" 2>/dev/null | sed '/^[[:space:]]*$/d' || true)"
-            if [ -n "$resp" ]; then
-              printf "%s\n" "$resp"
-              exit 0
-            fi
-          fi
+          ;;
+        /dev/wwan0at0|/dev/wwan0at1)
+          dev="$candidate"
+          ;;
+        *)
+          dev=""
           ;;
       esac
-      [ "$port" != "auto" ] && [ "$candidate" = "$port" ] && break
+      if [ -n "$dev" ] && [ -c "$dev" ]; then
+        resp="$(timeout 2 sh -c '
+          dev="$1"
+          cmd="$2"
+          tmpf="/tmp/at_resp_$$.txt"
+          rm -f "$tmpf"
+          cat "$dev" > "$tmpf" 2>/dev/null &
+          rpid=$!
+          sleep 0.04
+          printf "%s\r\n" "$cmd" > "$dev" 2>/dev/null || true
+          i=0
+          while [ "$i" -lt 12 ]; do
+            if grep -qE "(^|[[:space:]])(OK|ERROR|\+CME ERROR|\+CMS ERROR)([[:space:]]|$)" "$tmpf" 2>/dev/null; then
+              break
+            fi
+            sleep 0.08
+            i=$((i + 1))
+          done
+          kill "$rpid" 2>/dev/null || true
+          wait "$rpid" 2>/dev/null || true
+          tr -d "\r" < "$tmpf" 2>/dev/null || true
+          rm -f "$tmpf"
+        ' _ "$dev" "$at_cmd" 2>/dev/null | sed '/^[[:space:]]*$/d' || true)"
+        if [ -n "$resp" ]; then
+          printf "%s\n" "$resp"
+          exit 0
+        fi
+      fi
+      if [ "$port" != "auto" ] && [ "$candidate" = "$port" ]; then
+        break
+      fi
     done
     mm_out="$(mmcli -m any --command="$at_cmd" 2>&1 || true)"
     if [ -n "$mm_out" ]; then