Fix: IGate reads only the qty of bytes ready to be read.

lib/apex/igate_tcp.rb

@@ -112,10 +112,13 @@ module Apex
                 read_more = true
                 while read_more
                     selected = IO.select([@aprsis_sock], [], [], 0)
-                    if selected.first.length > 0
-                        recvd_data = @aprsis_sock.gets
-                        if recvd_data
-                            @data_buffer += recvd_data
+                    if selected.nil? == false
+                        ready_len = selected.first.length
+                        if ready_len > 0
+                            recvd_data = @aprsis_sock.read(ready_len)
+                            if recvd_data
+                                @data_buffer += recvd_data
+                            end
                         end
                     else
                         read_more = false