From 614ff1dc36b1ad33fd27f0786ff733fcc92abf33 Mon Sep 17 00:00:00 2001
From: Stéphane Raimbault <stephane.raimbault@gmail.com>
Date: Sun, 5 Dec 2010 00:02:29 +0100
Subject: [PATCH] Fix unit test of report slave ID in RTU

---
 src/modbus.c | 6 ++++--
 1 file changed, 4 insertions(+), 2 deletions(-)

diff --git a/src/modbus.c b/src/modbus.c
index e98b1e1..f43b849 100644
--- a/src/modbus.c
+++ b/src/modbus.c
@@ -344,8 +344,10 @@ static int receive_msg(modbus_t *ctx, int msg_length_computed,
                 /* It's useless to check the value of
                    msg_length_computed in this case (only
                    defined values are used). */
-                state = DATA;
-                break;
+                if (length_to_read != 0) {
+                    state = DATA;
+                    break;
+                } /* else switch straight to DATA */
             case DATA:
                 length_to_read = compute_data_length(ctx, msg);
                 msg_length_computed += length_to_read;
--
libgit2 0.21.4