Fixed problem with UCS2 encoded long messages

lib/defs.js

@@ -2,7 +2,8 @@
 
 // More or less copied from https://github.com/farhadi/node-smpp
 
-var iconv      = require('iconv-lite'),
+var log        = require('winston'),
+    iconv      = require('iconv-lite'),
     encodings  = {},
     filters    = {},
     tlvsById   = {},
@@ -135,7 +136,13 @@ types = {
 		},
 		write: function(value, buffer, offset) {
 			value = value || 0;
-			buffer.writeUInt8(value, offset);
+
+			try {
+				buffer.writeUInt8(value, offset);
+			} catch (err) {
+				log.error('larvitsmpp: lib/defs.js - Could not write integer value "' + value + '" on offset "' + offset + '" when buffer length is "' + buffer.length + '"');
+				throw err;
+			}
 		},
 		size: function() {
 			return 1;