From 7c808715b4314e32fb5c9959758b6eeaf153b61a Mon Sep 17 00:00:00 2001
From: Martin Preuss <martin@aquamaniac.de>
Date: Wed, 25 Jan 2023 16:29:16 +0100
Subject: [PATCH] aqhome: Use baudrate of 19200 bps.

---
 aqhome/serial.c | 26 ++++++++++++++++----------
 1 file changed, 16 insertions(+), 10 deletions(-)

diff --git a/aqhome/serial.c b/aqhome/serial.c
index b885e38..cb51a33 100644
--- a/aqhome/serial.c
+++ b/aqhome/serial.c
@@ -80,6 +80,7 @@ int AQH_Serial_Open(AQH_SERIAL *sr)
     return GWEN_ERROR_IO;
   }
   rv=cfsetispeed(&options, B19200);
+  //rv=cfsetispeed(&options, B9600);
   if (rv<0) {
     DBG_ERROR(NULL, "Error on cfsetispeed(%s): %s (%d)", sr->deviceName, strerror(errno), errno);
     return GWEN_ERROR_IO;
@@ -91,7 +92,7 @@ int AQH_Serial_Open(AQH_SERIAL *sr)
   }
 
   options.c_cflag &= ~PARENB;
-  options.c_cflag &= ~CSTOPB;
+  options.c_cflag &= ~CSTOPB;  /* use one stopbit insteadof 2 */
   options.c_cflag &= ~CSIZE;
   options.c_cflag |= CS8;
 
@@ -176,7 +177,7 @@ int AQH_Serial_Send(AQH_SERIAL *sr, const uint8_t *ptr, uint8_t len)
     return rv;
   }
 
-  usleep(10);
+  usleep(50);
 
   rv=_writeForced(sr, ptr, len);
   if (rv<0) {
@@ -222,15 +223,20 @@ int AQH_Serial_SendPacket(AQH_SERIAL *sr, uint8_t destAddr, const uint8_t *ptr,
   }
   x^=len;
 
-  /* send message */
-  rv=_writeForced(sr, ptr, len);
-  if (rv<0) {
-    DBG_INFO(NULL, "here (%d)", rv);
-    _attnHigh(sr);
-    return rv;
-  }
+  if (len>0) {
+    uint8_t i;
 
-  x^=_calcChecksum(ptr, len);
+    /* send message */
+    rv=_writeForced(sr, ptr, len);
+    if (rv<0) {
+      DBG_INFO(NULL, "here (%d)", rv);
+      _attnHigh(sr);
+      return rv;
+    }
+
+    for (i=0; i<len; i++)
+      x^=ptr[i];
+  }
 
   /* send XOR checksum */
   rv=_writeForced(sr, &x, 1);