move socat proxy stuff into its own init script

assets/stream_proxy

@@ -0,0 +1,19 @@
+#!/bin/sh /etc/rc.common
+
+START=99
+
+start() {
+        # install socat to ram
+        if [ ! -f /tmp/usr/bin/socat ]; then
+                /bin/sleep 60
+                opkg update
+                opkg install socat -d ram
+        fi
+
+        # start stream proxy
+        /tmp/usr/bin/socat TCP-LISTEN:8000,reuseaddr,fork,su=nobody,pf=ip6 TCP:192.168.3.4:8000 &
+}
+
+stop() {
+        killall socat
+}

assets/zz_custom

@@ -13,13 +13,5 @@ boot() {
         # ipv6 fixed
         /sbin/ip -6 addr add 2a03:2260:a:b::1:66/64 dev br-client
 
-        # install socat to ram
-        /bin/sleep 60
-        opkg update
-        opkg install socat -d ram
-
-        # start stream proxy
-        /tmp//usr/bin/socat TCP-LISTEN:8000,reuseaddr,fork,su=nobody,pf=ip6 TCP:192.168.3.4:8000 &
-
         echo zz_custom ended | logger
 }