From 78dac16520d0f4fe57eaa8dd60735d1727a40e19 Mon Sep 17 00:00:00 2001
From: Andrew Tridgell <andrew@tridgell.net>
Date: Wed, 30 Nov 2022 07:59:21 +1100
Subject: [PATCH] SITL: make serial buffer size configurable

we need a larger buffer size for NMEA GPS modules
---
 libraries/SITL/SIM_GPS.cpp          | 2 +-
 libraries/SITL/SIM_SerialDevice.cpp | 6 +++---
 libraries/SITL/SIM_SerialDevice.h   | 2 +-
 3 files changed, 5 insertions(+), 5 deletions(-)

diff --git a/libraries/SITL/SIM_GPS.cpp b/libraries/SITL/SIM_GPS.cpp
index 1c23225405..5e5b732b5f 100644
--- a/libraries/SITL/SIM_GPS.cpp
+++ b/libraries/SITL/SIM_GPS.cpp
@@ -36,7 +36,7 @@ extern const AP_HAL::HAL& hal;
 using namespace SITL;
 
 GPS::GPS(uint8_t _instance) :
-    SerialDevice(),
+    SerialDevice(8192, 2048),
     instance{_instance}
 {
 
diff --git a/libraries/SITL/SIM_SerialDevice.cpp b/libraries/SITL/SIM_SerialDevice.cpp
index 9f7a2538ce..64eb1edb87 100644
--- a/libraries/SITL/SIM_SerialDevice.cpp
+++ b/libraries/SITL/SIM_SerialDevice.cpp
@@ -27,10 +27,10 @@
 
 using namespace SITL;
 
-SerialDevice::SerialDevice()
+SerialDevice::SerialDevice(uint16_t tx_bufsize, uint16_t rx_bufsize)
 {
-    to_autopilot = new ByteBuffer{512};
-    from_autopilot = new ByteBuffer{512};
+    to_autopilot = new ByteBuffer{tx_bufsize};
+    from_autopilot = new ByteBuffer{rx_bufsize};
 }
 
 bool SerialDevice::init_sitl_pointer()
diff --git a/libraries/SITL/SIM_SerialDevice.h b/libraries/SITL/SIM_SerialDevice.h
index b6d24d77c6..2a36497345 100644
--- a/libraries/SITL/SIM_SerialDevice.h
+++ b/libraries/SITL/SIM_SerialDevice.h
@@ -26,7 +26,7 @@ namespace SITL {
 class SerialDevice {
 public:
 
-    SerialDevice();
+    SerialDevice(uint16_t tx_bufsize=512, uint16_t rx_bufsize=512);
 
 
     // methods for autopilot to use to talk to device: