Add cbma_check_connected.sh functional test

common/tests/functional/test_cbma/cbma_check_connected.sh

@@ -0,0 +1,58 @@
+#!/bin/sh
+
+TIMEOUT_SECONDS=10
+
+
+if [ $# -eq 0 ]; then
+    echo "Usage: $0 <bat-iface> [<peer-mac>]"
+    exit 1
+fi
+
+check_dependencies() {
+    for t in batctl; do
+        if ! type $t >/dev/null 2>&1; then
+            echo "[!] FATAL: '$t' is missing!" >&2
+            exit 2
+        fi
+    done
+}
+
+check_interface() {
+    iface="$1"
+
+    if [ ! -e "/sys/class/net/${iface}/address" ]; then
+        echo "'$iface' does not exist" >&2
+        exit 3
+    fi
+}
+
+check_mac_address() {
+    mac="$1"
+
+    if [ -n "$mac" ] && ! echo "$mac" | grep -Eiqx '([0-9a-f]{2}:){5}[0-9a-f]{2}'; then
+	      echo "'$mac' is not a valid MAC address" >&2
+	      exit 4
+    fi
+}
+
+cbma_check_connected() {
+    iface="$1"
+    peer_mac="${2:-.}"
+
+    elapsed_seconds=0
+    while [ $((elapsed_seconds++)) -lt $TIMEOUT_SECONDS ]; do
+        peers="$(batctl meshif $iface n -H -n)"
+        if expr "$peers" : "$peer_mac" 2>/dev/null >&2; then
+            echo 'Pass'
+            return
+        fi
+        sleep 1
+    done
+    echo 'Fail'
+    exit 5
+}
+
+check_dependencies
+check_interface $1
+check_mac_address $2
+cbma_check_connected $@