units/tsjlua0001: parse sipcjson output in lua with cjson

units/tsjlua0001/kamailio-tsjlua0001.lua

@@ -1,8 +1,24 @@
+local cjson = require "cjson"
+
 function ksr_request_route()
 
 	KSR.sipjson.sj_serialize("0B", "$var(json)");
 
-	KSR.dbg("===== json:\n" .. KSR.pv.getw("$var(json)")  .. "\n");
+	local vjson = KSR.pv.getw("$var(json)");
+	if string.len(vjson) < 10 then
+		KSR.dbg("===== short json:\n" .. vjson  .. "\n");
+		KSR.sl.sl_send_reply("200", "OK");
+		KSR.x.exit();
+	end
+
+	local sjv = cjson.decode(vjson);
+	if sjv["rU"] == nil or string.len(sjv["rU"]) < 1 then
+		KSR.dbg("===== rU key is not set\n");
+	else
+		KSR.dbg("===== rU key is set: " .. sjv["rU"] .. "\n");
+	end
+
+	KSR.dbg("===== long json:\n" .. vjson  .. "\n");
 	KSR.sl.sl_send_reply("200", "OK");
 	KSR.x.exit();