rpc: use the standart port derivation in connect command

Complete implementation of BOLT1 port derivation proposal lightning/bolts#968

Changelog-Added: rpc: use the standard port derivation in connect command when the port is not specified.

Signed-off-by: Vincenzo Palazzo <[email protected]>

Author: vincenzopalazzo

lightningd/connect_control.c

@@ -1,4 +1,5 @@
 #include "config.h"
+#include <bitcoin/chainparams.h>
 #include <ccan/err/err.h>
 #include <ccan/tal/str/str.h>
 #include <common/configdir.h>
@@ -140,7 +141,7 @@ static struct command_result *json_connect(struct command *cmd,
 		/* Is there a port? */
 		if (!port) {
 			port = tal(cmd, u32);
-			*port = DEFAULT_PORT;
+			*port = DEFAULT_PORT + chainparams->rpc_port - 8332;
 		}
 		addr = tal(cmd, struct wireaddr_internal);
 		if (!parse_wireaddr_internal(name, addr, *port, false,