drivers/tripplitesu.c: add 1s delay in command_send

Intermittent communication timeouts were observed when multiple commands
were sent in rapid succession.

Adding a 1-second delay at the beginning of command_send() ensures the
hardware buffer is ready and prevents the "read timeout" errors.

Signed-off-by: TomZanna <git@tomzanna.com>

Author: TomZanna

data/driver.list.in

@@ -1568,6 +1568,7 @@
 "Tripp Lite"	"ups"	"3"	"SU3000XLCD"	"USB (protocol 4004)"	"usbhid-ups"	# http://www.tripplite.com/en/products/model.cfm?txtSeriesID=744&txtModelID=5342
 "Tripp Lite"	"ups"	"3"	"SUINT1000RTXL2UA"	"USB (protocol 4001)"	"usbhid-ups"	# http://www.tripplite.com/en/products/model.cfm?txtModelID=3983
 "Tripp Lite"	"ups"	"3"	"SUINT1500RTXL2UA"	"USB (protocol 4001)"	"usbhid-ups"	# http://www.tripplite.com/en/products/model.cfm?txtSeriesID=934&txtModelID=2720
+"Tripp Lite"	"ups"	"3"	"SUINT1500RTXL2UA"	"Serial"	"tripplitesu"	# http://www.tripplite.com/en/products/model.cfm?txtSeriesID=934&txtModelID=2720
 "Tripp Lite"	"ups"	"3"	"SUINT2200RTXL2UA"	"USB (protocol 4001)"	"usbhid-ups"	# http://www.tripplite.com/en/products/model.cfm?txtSeriesID=934&txtModelID=3970
 "Tripp Lite"	"ups"	"3"	"SUINT3000RTXL2U"	"USB (protocol 4005)"	"usbhid-ups"	# http://www.tripplite.com/en/products/model.cfm?txtModelID=4523
 

drivers/tripplitesu.c

@@ -126,7 +126,7 @@
 #include "nut_stdint.h"
 
 #define DRIVER_NAME	"Tripp Lite SmartOnline driver"
-#define DRIVER_VERSION	"0.11"
+#define DRIVER_VERSION	"0.12"
 
 /* driver description structure */
 upsdrv_info_t upsdrv_info = {
@@ -222,6 +222,7 @@ static ssize_t do_command(char type, const char *command, const char *parameters
 	size_t	count;
 	ssize_t	ret;
 
+	usleep(1E6);
 	ser_flush_io(upsfd);
 
 	if (response) {