From 112bb260acb8655e929cf377b18f505d62608eb1 Mon Sep 17 00:00:00 2001
From: Simon Lundell <s.lundell@gmail.com>
Date: Sun, 18 Feb 2018 11:44:04 +0100
Subject: [PATCH] Do not send new G-CODEs when the RX buffer is filling up.
 This is in an attempt to fix #1777 where smoothieware based printers would
 halt in the middle of the print.

---
 plugins/USBPrinting/USBPrinterOutputDevice.py | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/plugins/USBPrinting/USBPrinterOutputDevice.py b/plugins/USBPrinting/USBPrinterOutputDevice.py
index b53f502d81..c177ad64d6 100644
--- a/plugins/USBPrinting/USBPrinterOutputDevice.py
+++ b/plugins/USBPrinting/USBPrinterOutputDevice.py
@@ -304,7 +304,7 @@ class USBPrinterOutputDevice(PrinterOutputDevice):
                         self._sendCommand(self._command_queue.get())
                     elif self._paused:
                         pass  # Nothing to do!
-                    else:
+                    elif self._serial.in_waiting < 256: # Do not send new G-CODE when the RX buffer is filling up
                         self._sendNextGcodeLine()
                 elif b"resend" in line.lower() or b"rs" in line:
                     # A resend can be requested either by Resend, resend or rs.