put serial_port in blocking read

smartmeter.rb

@@ -17,6 +17,8 @@ def open_device
   begin
     # Open connection to serial port
     io_device = SerialPort.new("/dev/ttyUSB1", 9600, 7, 1, SerialPort::EVEN)
+    # Make reading blocking
+    io_device.read_timeout = 0
   rescue 
     p "Serialport Error - reverting to 'example_blurp.txt'"
     io_device = File.open("example_blurp.txt")

test-serial.rb

@@ -24,6 +24,9 @@ if __FILE__ == $0
 
 sp = SerialPort.new(port_str, baud_rate, data_bits, stop_bits, parity)
 
+# Make reading blocking
+sp.read_timeout = 0
+
 #just read forever
 while true do
   printf("%c", sp.getc)