From 4e7a6c3d241f1da3da89d384e84c0c1547d17451 Mon Sep 17 00:00:00 2001
From: Reinhard Russinger <reinhard@russinger.at>
Date: Mon, 18 Jun 2018 18:39:18 +0200
Subject: [PATCH] libmodbus GfA fflush for debug

---
 package/libmodbus/002-GfA-fflush-for-debug.patch | 47 ++++++++++++++++++++++++
 1 file changed, 47 insertions(+)
 create mode 100644 package/libmodbus/002-GfA-fflush-for-debug.patch

diff --git a/package/libmodbus/002-GfA-fflush-for-debug.patch b/package/libmodbus/002-GfA-fflush-for-debug.patch
new file mode 100644
index 0000000..93eaa9a
--- /dev/null
+++ b/package/libmodbus/002-GfA-fflush-for-debug.patch
@@ -0,0 +1,47 @@
+diff '--exclude=.libs*' -Naurp libmodbus-3.0.6/src/modbus.c b/src/modbus.c
+--- libmodbus-3.0.6/src/modbus.c	2014-04-02 23:34:00.000000000 +0200
++++ b/src/modbus.c	2018-06-15 08:36:32.657047324 +0200
+@@ -170,6 +170,7 @@ static int send_msg(modbus_t *ctx, uint8
+         for (i = 0; i < msg_length; i++)
+             printf("[%.2X]", msg[i]);
+         printf("\n");
++        fflush(stdout);
+     }
+ 
+     /* In recovery mode, the write command will be issued until to be
+@@ -407,6 +408,7 @@ static int receive_msg(modbus_t *ctx, ui
+             int i;
+             for (i=0; i < rc; i++)
+                 printf("<%.2X>", msg[msg_length + i]);
++            fflush(stdout);
+         }
+ 
+         /* Sums bytes received */
+diff '--exclude=.libs*' -Naurp libmodbus-3.0.6/src/modbus-rtu.c b/src/modbus-rtu.c
+--- libmodbus-3.0.6/src/modbus-rtu.c	2018-06-16 17:44:19.011371930 +0200
++++ b/src/modbus-rtu.c	2018-06-15 08:34:34.544888427 +0200
+@@ -260,7 +260,7 @@ static int win32_ser_read(struct win32_s
+ 
+ ssize_t _modbus_rtu_write_n_read(modbus_t *ctx, const uint8_t *req, int req_length) {
+  ssize_t w, r, i;
+- uint8_t rb[req_length];
++ uint8_t rb[512];
+ 
+  // Transmit
+  w = write(ctx->s, req, req_length);
+@@ -273,6 +273,7 @@ ssize_t _modbus_rtu_write_n_read(modbus_
+   for (i = 0; i < r; ++i)
+   fprintf(stderr, "|%02X|", rb[i]);
+   fprintf(stderr, "\n");
++  fflush(stderr);
+  }
+ 
+  return w;
+@@ -325,6 +326,7 @@ int _modbus_rtu_check_integrity(modbus_t
+         if (ctx->debug) {
+             fprintf(stderr, "ERROR CRC received %0X != CRC calculated %0X\n",
+                     crc_received, crc_calculated);
++            fflush(stderr);                    
+         }
+         if (ctx->error_recovery & MODBUS_ERROR_RECOVERY_PROTOCOL) {
+             _modbus_rtu_flush(ctx);
-- 
2.7.4