diff --git a/library/HTTP_Adapter.ttcn b/library/HTTP_Adapter.ttcn
new file mode 100644
index 0000000..a9d0d83
--- /dev/null
+++ b/library/HTTP_Adapter.ttcn
@@ -0,0 +1,101 @@
+module HTTP_Adapter {
+
+/* HTTP Adapter component, originally part of Integration Tests for osmo-remsim-server
+ * (C) 2019 by Harald Welte <laforge@gnumonks.org>
+ * All rights reserved.
+ *
+ * Released under the terms of GNU General Public License, Version 2 or
+ * (at your option) any later version.
+ *
+ * SPDX-License-Identifier: GPL-2.0-or-later
+ *
+ * This test suite tests osmo-remsim-server by attaching to the external interfaces
+ * such as RSPRO for simulated clients + bankds and RSRES (REST backend interface).
+ */
+
+import from HTTPmsg_Types all;
+import from HTTPmsg_PortType all;
+
+type component http_CT {
+	port HTTPmsg_PT HTTP;
+	var charstring g_http_host;
+	var integer g_http_port;
+};
+
+function f_http_init(charstring host, integer http_port) runs on http_CT {
+	map(self:HTTP, system:HTTP);
+	g_http_host := host;
+	g_http_port := http_port;
+}
+
+template (value) Connect ts_HTTP_Connect(template (value) charstring hostname,
+					 template (value) integer http_port := 80,
+					 template (value) boolean use_ssl := false) := {
+	hostname := hostname,
+	portnumber := http_port,
+	use_ssl := use_ssl
+}
+template (value) Close ts_HTTP_Close := { client_id := omit };
+
+template (value) HeaderLines ts_HTTP_Header(charstring body) := {
+	{ header_name := "Content-Type", header_value := "application/json" },
+	{ header_name := "Content-Length", header_value := int2str(lengthof(body)) }
+}
+
+template (value) HTTPMessage ts_HTTP_Req(charstring url,
+					 charstring method := "GET",
+					 charstring body := "",
+					 integer v_maj := 1, integer v_min := 1) := {
+	request := {
+		client_id := omit,
+		method := method,
+		uri := url,
+		version_major := v_maj,
+		version_minor := v_min,
+		header := ts_HTTP_Header(body),
+		body := body
+	}
+}
+
+template HTTPMessage tr_HTTP_Resp(template integer sts := ?) := {
+	response := {
+		client_id := ?,
+		version_major := ?,
+		version_minor := ?,
+		statuscode := sts,
+		statustext := ?,
+		header := ?,
+		body := ?
+	}
+};
+
+template HTTPMessage tr_HTTP_Resp2xx := tr_HTTP_Resp((200..299));
+
+/* run a HTTP request and return the response */
+function f_http_transact(charstring url, charstring method := "GET",
+			 charstring body := "", template HTTPMessage exp := tr_HTTP_Resp2xx)
+runs on http_CT return HTTPMessage {
+	var HTTPMessage resp;
+	timer T := 2.0;
+
+	HTTP.send(ts_HTTP_Connect(g_http_host, g_http_port));
+	//HTTP.receive(Connect_result:?);
+	HTTP.send(ts_HTTP_Req(url, method, body));
+	T.start;
+	alt {
+	[] HTTP.receive(exp) -> value resp {
+		setverdict(pass);
+		}
+	[] HTTP.receive(tr_HTTP_Resp) -> value resp {
+		setverdict(fail, "Unexpected HTTP response ", resp);
+		}
+	[] T.timeout {
+		setverdict(fail, "Timeout waiting for HTTP response");
+		self.stop;
+		}
+	}
+	HTTP.send(ts_HTTP_Close);
+	return resp;
+}
+
+}