NetworkCompatibilityChecker will not be executed at each Node<>::start(), there's special method for that - Node<>::checkNetworkCompatibility()

libuavcan/include/uavcan/node/node.hpp

@@ -51,8 +51,6 @@ class UAVCAN_EXPORT Node : public INode
 
     bool started_;
 
-    int initNetwork(NetworkCompatibilityCheckResult& node_init_result);
-
 protected:
     virtual void registerInternalFailure(const char* msg)
     {
@@ -99,7 +97,9 @@ public:
 
     bool isStarted() const { return started_; }
 
-    int start(NetworkCompatibilityCheckResult& node_init_result);
+    int start();
+
+    int checkNetworkCompatibility(NetworkCompatibilityCheckResult& result);
 
     /*
      * Initialization methods
@@ -173,25 +173,7 @@ public:
 
 template <std::size_t MemPoolSize_, unsigned OutgoingTransferRegistryStaticEntries,
           unsigned OutgoingTransferMaxPayloadLen>
-int Node<MemPoolSize_, OutgoingTransferRegistryStaticEntries, OutgoingTransferMaxPayloadLen>::
-initNetwork(NetworkCompatibilityCheckResult& node_init_result)
-{
-    int res = NetworkCompatibilityChecker::publishGlobalDiscoveryRequest(*this);
-    if (res < 0)
-    {
-        return res;
-    }
-    NetworkCompatibilityChecker initializer(*this);
-    StaticAssert<(sizeof(initializer) < 1200)>::check();
-    res = initializer.execute();
-    node_init_result = initializer.getResult();
-    return res;
-}
-
-template <std::size_t MemPoolSize_, unsigned OutgoingTransferRegistryStaticEntries,
-          unsigned OutgoingTransferMaxPayloadLen>
-int Node<MemPoolSize_, OutgoingTransferRegistryStaticEntries, OutgoingTransferMaxPayloadLen>::
-start(NetworkCompatibilityCheckResult& node_init_result)
+int Node<MemPoolSize_, OutgoingTransferRegistryStaticEntries, OutgoingTransferMaxPayloadLen>::start()
 {
     if (started_)
     {
@@ -225,12 +207,34 @@ start(NetworkCompatibilityCheckResult& node_init_result)
     {
         goto fail;
     }
-    res = initNetwork(node_init_result);
-    started_ = (res >= 0) && node_init_result.isOk();
+    started_ = res >= 0;
     return res;
 fail:
     assert(res < 0);
     return res;
 }
 
+template <std::size_t MemPoolSize_, unsigned OutgoingTransferRegistryStaticEntries,
+          unsigned OutgoingTransferMaxPayloadLen>
+int Node<MemPoolSize_, OutgoingTransferRegistryStaticEntries, OutgoingTransferMaxPayloadLen>::
+checkNetworkCompatibility(NetworkCompatibilityCheckResult& result)
+{
+    if (!started_)
+    {
+        return -ErrNotInited;
+    }
+
+    int res = NetworkCompatibilityChecker::publishGlobalDiscoveryRequest(*this);
+    if (res < 0)
+    {
+        return res;
+    }
+
+    NetworkCompatibilityChecker checker(*this);
+    StaticAssert<(sizeof(checker) < 2048)>::check();
+    res = checker.execute();
+    result = checker.getResult();
+    return res;
+}
+
 }

libuavcan/test/node/node.cpp

@@ -59,7 +59,9 @@ TEST(Node, Basic)
      * Init the second node - network is empty
      */
     uavcan::NetworkCompatibilityCheckResult result;
-    ASSERT_LE(0, node2.start(result));
+    ASSERT_LE(0, node2.start());
+    ASSERT_LE(0, node2.checkNetworkCompatibility(result));
+    ASSERT_TRUE(result.isOk());
 
     ASSERT_FALSE(node_status_monitor.findNodeWithWorstStatus().isValid());
 
@@ -68,7 +70,9 @@ TEST(Node, Basic)
      */
     ASSERT_FALSE(node1.isStarted());
     ASSERT_EQ(-uavcan::ErrNotInited, node1.spin(uavcan::MonotonicDuration::fromMSec(20)));
-    ASSERT_LE(0, node1.start(result));
+    ASSERT_LE(0, node1.start());
+    ASSERT_LE(0, node1.checkNetworkCompatibility(result));
+    ASSERT_TRUE(result.isOk());
     ASSERT_TRUE(node1.isStarted());
 
     ASSERT_EQ(1, node_status_monitor.findNodeWithWorstStatus().get());

libuavcan_drivers/linux/test/test_node.cpp

@@ -21,17 +21,23 @@ static uavcan_linux::NodePtr initNode(const std::vector<std::string>& ifaces, ua
     node->getLogger().setLevel(uavcan::protocol::debug::LogLevel::DEBUG);
 
     /*
-     * Starting the node. This may take a few seconds.
+     * Starting the node.
      */
     std::cout << "Starting the node..." << std::endl;
-    uavcan::NetworkCompatibilityCheckResult init_result;
-    const int start_res = node->start(init_result);
+    const int start_res = node->start();
     std::cout << "Start returned: " << start_res << std::endl;
     ENFORCE(0 == start_res);
+
+    /*
+     * Checking if our node conflicts with other nodes. This may take a few seconds.
+     */
+    uavcan::NetworkCompatibilityCheckResult init_result;
+    ENFORCE(0 == node->checkNetworkCompatibility(init_result));
     if (!init_result.isOk())
     {
         throw std::runtime_error("Network conflict with node " + std::to_string(init_result.conflicting_node.get()));
     }
+
     std::cout << "Node started successfully" << std::endl;
 
     /*

libuavcan_drivers/linux/test/test_node_status_monitor.cpp

@@ -108,15 +108,7 @@ static uavcan_linux::NodePtr initNode(const std::vector<std::string>& ifaces, ua
     auto node = uavcan_linux::makeNode(ifaces);
     node->setNodeID(nid);
     node->setName(name.c_str());
-
-    uavcan::NetworkCompatibilityCheckResult init_result;
-    const int start_res = node->start(init_result);
-    ENFORCE(0 == start_res);
-    if (!init_result.isOk())
-    {
-        throw std::runtime_error("Network conflict with node " + std::to_string(init_result.conflicting_node.get()));
-    }
-
+    ENFORCE(0 == node->start());  // This node doesn't check its network compatibility
     node->setStatusOk();
     return node;
 }

libuavcan_drivers/linux/test/test_time_sync.cpp

@@ -17,9 +17,10 @@ static uavcan_linux::NodePtr initNode(const std::vector<std::string>& ifaces, ua
     node->setNodeID(nid);
     node->setName(name.c_str());
 
+    ENFORCE(0 == node->start());
+
     uavcan::NetworkCompatibilityCheckResult init_result;
-    const int start_res = node->start(init_result);
-    ENFORCE(0 == start_res);
+    ENFORCE(0 == node->checkNetworkCompatibility(init_result));
     if (!init_result.isOk())
     {
         throw std::runtime_error("Network conflict with node " + std::to_string(init_result.conflicting_node.get()));

libuavcan_drivers/stm32/test_stm32f107/src/main.cpp

@@ -81,16 +81,23 @@ public:
          */
         while (true)
         {
-            uavcan::NodeInitializationResult init_result;
-            const int uavcan_start_res = node.start(init_result);
+            // Calling start() multiple times is OK - only the first successfull call will be effective
+            int res = node.start();
 
-            if (uavcan_start_res < 0)
+            uavcan::NetworkCompatibilityCheckResult ncc_result;
+            if (res >= 0)
             {
-                lowsyslog("Node initialization failure: %i, will try agin soon\n", uavcan_start_res);
+                lowsyslog("Checking network compatibility...\n");
+                res = node.checkNetworkCompatibility(ncc_result);
             }
-            else if (!init_result.isOk())
+
+            if (res < 0)
             {
-                lowsyslog("Network conflict with %u, will try again soon\n", init_result.conflicting_node.get());
+                lowsyslog("Node initialization failure: %i, will try agin soon\n", res);
+            }
+            else if (!ncc_result.isOk())
+            {
+                lowsyslog("Network conflict with %u, will try again soon\n", ncc_result.conflicting_node.get());
             }
             else
             {