From 2cb177ef7260d5877bbe6c79c8112c677a076c3b Mon Sep 17 00:00:00 2001
From: Andrew Tridgell <andrew@tridgell.net>
Date: Sun, 10 Dec 2023 07:11:24 +1100
Subject: [PATCH] AP_SerialManager: added PPP serial type

---
 libraries/AP_SerialManager/AP_SerialManager.cpp      | 9 ++++++++-
 libraries/AP_SerialManager/AP_SerialManager.h        | 1 +
 libraries/AP_SerialManager/AP_SerialManager_config.h | 5 +++++
 3 files changed, 14 insertions(+), 1 deletion(-)

diff --git a/libraries/AP_SerialManager/AP_SerialManager.cpp b/libraries/AP_SerialManager/AP_SerialManager.cpp
index 24a694e2d0..3d2ed06f5a 100644
--- a/libraries/AP_SerialManager/AP_SerialManager.cpp
+++ b/libraries/AP_SerialManager/AP_SerialManager.cpp
@@ -580,7 +580,14 @@ void AP_SerialManager::init()
                     uart->set_unbuffered_writes(true);
                     break;
 #endif
-
+#if AP_NETWORKING_BACKEND_PPP
+                case SerialProtocol_PPP:
+                    uart->begin(state[i].baudrate(),
+                                         AP_SERIALMANAGER_PPP_BUFSIZE_RX,
+                                         AP_SERIALMANAGER_PPP_BUFSIZE_TX);
+                    break;
+#endif
+                    
                 default:
                     uart->begin(state[i].baudrate());
             }
diff --git a/libraries/AP_SerialManager/AP_SerialManager.h b/libraries/AP_SerialManager/AP_SerialManager.h
index 30bae549f6..d569d1f066 100644
--- a/libraries/AP_SerialManager/AP_SerialManager.h
+++ b/libraries/AP_SerialManager/AP_SerialManager.h
@@ -81,6 +81,7 @@ public:
         SerialProtocol_DDS_XRCE = 45,
         SerialProtocol_IMUOUT = 46,
         // Reserving Serial Protocol 47 for SerialProtocol_IQ
+        SerialProtocol_PPP = 48,
         SerialProtocol_NumProtocols                    // must be the last value
     };
 
diff --git a/libraries/AP_SerialManager/AP_SerialManager_config.h b/libraries/AP_SerialManager/AP_SerialManager_config.h
index 88bf3ccaa3..a09a2995a0 100644
--- a/libraries/AP_SerialManager/AP_SerialManager_config.h
+++ b/libraries/AP_SerialManager/AP_SerialManager_config.h
@@ -137,6 +137,11 @@
 #define AP_SERIALMANAGER_IMUOUT_BUFSIZE_RX     128
 #define AP_SERIALMANAGER_IMUOUT_BUFSIZE_TX     2048
 
+// PPP protocol
+#define AP_SERIALMANAGER_PPP_BAUD           921600
+#define AP_SERIALMANAGER_PPP_BUFSIZE_RX     4096
+#define AP_SERIALMANAGER_PPP_BUFSIZE_TX     4096
+
 #ifndef HAL_HAVE_SERIAL0
 #define HAL_HAVE_SERIAL0 HAL_NUM_SERIAL_PORTS > 0
 #endif