AP_Networking: handle PPP software flow control

Author: tridge

libraries/AP_Networking/AP_Networking.cpp

@@ -81,8 +81,7 @@ const AP_Param::GroupInfo AP_Networking::var_info[] = {
     // @Param: TESTS
     // @DisplayName: Test enable flags
     // @Description: Enable/Disable networking tests
-    // @Bitmask: 0:UDP echo test,1:TCP echo test, 2:TCP discard test, 3:TCP reflect test
-    // @RebootRequired: True
+    // @Bitmask: 0:UDP echo test,1:TCP echo test,2:TCP discard test,3:TCP reflect test,4:Connector loopback test,5:TCP discard server,6:15-second TCP discard test
     // @User: Advanced
     AP_GROUPINFO("TESTS", 7,  AP_Networking,    param.tests,   0),
 
@@ -93,8 +92,8 @@ const AP_Param::GroupInfo AP_Networking::var_info[] = {
 
     // @Param: OPTIONS
     // @DisplayName: Networking options
-    // @Description: Networking options
-    // @Bitmask: 0:EnablePPP Ethernet gateway, 1:Enable CAN1 multicast endpoint, 2:Enable CAN2 multicast endpoint, 3:Enable CAN1 multicast bridged, 4:Enable CAN2 multicast bridged, 5:DisablePPPTimeout, 6:DisablePPPEchoLimit, 7:Capture to file
+    // @Description: Networking options. PPP software flow control must be enabled on both PPP endpoints
+    // @Bitmask: 0:EnablePPP Ethernet gateway, 1:Enable CAN1 multicast endpoint, 2:Enable CAN2 multicast endpoint, 3:Enable CAN1 multicast bridged, 4:Enable CAN2 multicast bridged, 5:DisablePPPTimeout, 6:DisablePPPEchoLimit, 7:Capture to file, 8:Enable PPP software flow control
     // @RebootRequired: True
     // @User: Advanced
     AP_GROUPINFO("OPTIONS", 9,  AP_Networking,    param.options, 0),
@@ -267,6 +266,9 @@ void AP_Networking::update()
     }
     backend->update();
     announce_address_changes();
+#if AP_NETWORKING_TESTS_ENABLED
+    start_tests();
+#endif
 }
 
 uint32_t AP_Networking::convert_netmask_bitcount_to_ip(const uint32_t netmask_bitcount)

libraries/AP_Networking/AP_Networking.h

@@ -177,6 +177,7 @@ class AP_Networking
 #if AP_NETWORKING_CAPTURE_ENABLED
         CAPTURE_PACKETS=(1U<<7),
 #endif
+        PPP_SOFTWARE_FLOW_CONTROL=(1U<<8),
     };
     bool option_is_set(OPTION option) const {
         return (param.options.get() & int32_t(option)) != 0;
@@ -330,12 +331,17 @@ class AP_Networking
         TEST_TCP_DISCARD = (1U<<2),
         TEST_TCP_REFLECT = (1U<<3),
         TEST_CONNECTOR_LOOPBACK = (1U<<4),
+        TEST_TCP_DISCARD_SERVER = (1U<<5),
+        TEST_TCP_DISCARD_ONESHOT = (1U<<6),
     };
+    uint32_t tests_started = 0;
     void start_tests(void);
     void test_UDP_client(void);
     void test_TCP_client(void);
     void test_TCP_discard(void);
+    void test_TCP_discard_oneshot(void);
     void test_TCP_reflect(void);
+    void test_TCP_discard_server(void);
     void test_connector_loopback(void);
 #endif // AP_NETWORKING_TESTS_ENABLED