Updated some comments, and removed extra printf from environment.

bacnet-stack/bin/readme.txt

@@ -60,6 +60,9 @@ BACNET_APDU_TIMEOUT - set this value in milliseconds to change
     the APDU timeout.  APDU Timeout is how much time a client
     waits for a response from a BACnet device. Default is 3000ms.
 
+BACNET_APDU_RETRIES - indicate the maximum number of times that
+    an APDU shall be retransmitted.
+
 BACNET_IFACE - set this value to dotted IP address (Windows) of
     the interface (see ipconfig command on Windows) for which you
     want to bind.  On Linux, set this to the /dev interface

bacnet-stack/demo/handler/dlenv.c

@@ -203,6 +203,8 @@ void dlenv_maintenance_timer(
  *   - BACNET_APDU_TIMEOUT - set this value in milliseconds to change
  *     the APDU timeout.  APDU Timeout is how much time a client
  *     waits for a response from a BACnet device.
+ *   - BACNET_APDU_RETRIES - indicate the maximum number of times that
+ *     an APDU shall be retransmitted.
  *   - BACNET_IFACE - set this value to dotted IP address (Windows) of
  *     the interface (see ipconfig command on Windows) for which you
  *     want to bind.  On Linux, set this to the /dev interface
@@ -284,7 +286,6 @@ void dlenv_init(
     pEnv = getenv("BACNET_APDU_TIMEOUT");
     if (pEnv) {
         apdu_timeout_set((uint16_t) strtol(pEnv, NULL, 0));
-        fprintf(stderr, "BACNET_APDU_TIMEOUT=%s\r\n", pEnv);
     } else {
 #if defined(BACDL_MSTP)
         apdu_timeout_set(60000);