From 583de8a6fada1c4780fbc873bb3f0146e854a5d0 Mon Sep 17 00:00:00 2001
From: John Wells <jfw@jfwhome.com>
Date: Mon, 1 Jan 2024 22:54:56 +0000
Subject: [PATCH] Flip-flat: Allow handshake without ioctl on virtual serial
 connection

Try premptively pinging the flip-flat without dropping the RTS line so that the handshake succeeds in the case of a virtual serial port (pty with no ioctl).
---
 drivers/auxiliary/flip_flat.cpp | 8 ++++++++
 1 file changed, 8 insertions(+)

diff --git a/drivers/auxiliary/flip_flat.cpp b/drivers/auxiliary/flip_flat.cpp
index eb9a494219..6bd8dd1a3b 100644
--- a/drivers/auxiliary/flip_flat.cpp
+++ b/drivers/auxiliary/flip_flat.cpp
@@ -145,6 +145,14 @@ bool FlipFlat::Handshake()
 
     PortFD = serialConnection->getPortFD();
 
+    /* Try handshake first in case of virtual serial port where ioctl will fail*/
+    if (ping())
+    {
+        return true;
+    } 
+  
+    LOGF_DEBUG("Initial handshake unsuccessful, dropping RTS", command);
+
     /* Drop RTS */
     int i = 0;
     i |= TIOCM_RTS;