From 39c058cb9a21d8c093fb14a4f4a013195a0eaf88 Mon Sep 17 00:00:00 2001
From: Jonathan McCrohan <jmccrohan@gmail.com>
Date: Tue, 3 Apr 2012 23:38:33 +0100
Subject: modbuslog: increase backoff time

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

diff --git a/src/modbuslog.c b/src/modbuslog.c
index d967e4a..cb509ea 100644
--- a/src/modbuslog.c
+++ b/src/modbuslog.c
@@ -268,10 +268,12 @@ int main(int argc, char *argv[]) {
 					if (rc == -1) {
 						syslog(LOG_ERR, "libmodbus error: [%s]",
 								modbus_strerror(errno));
-						sleep(1);
+						// back off for 2 secs, increasing by 2 for each
+						// incorrect reply
+						sleep(2+retry*2);
 					}
 					retry++;
-				} while ((rc == -1) && (retry < (modbus_retry + 1)));
+				} while ((rc == -1) && (retry <= modbus_retry));
 
 				if (rc == -1){
 					// retried, but still no luck
-- 
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