Fix crash when Arduino_RouterBridge is included but begin() not called

library.json

@@ -11,7 +11,7 @@
     "url": "https://github.com/bcmi-labs/Arduino_RouterBridge",
     "maintainer": true
   },
-  "version": "0.1.2",
+  "version": "0.1.3",
   "license": "MPL2.0",
   "frameworks": "arduino",
   "platforms": "*",

library.properties

@@ -1,5 +1,5 @@
 name=Arduino_RouterBridge
-version=0.1.2
+version=0.1.3
 author=BCMI-labs
 maintainer=BCMI-labs
 sentence=A RPC bridge for Arduino UNO Q boards

src/bridge.h

@@ -33,25 +33,31 @@ class BridgeClass {
     RPCClient* client = nullptr;
     RPCServer* server = nullptr;
     HardwareSerial* serial_ptr = nullptr;
-    ITransport* transport;
+    ITransport* transport = nullptr;
 
-    struct k_mutex read_mutex;
-    struct k_mutex write_mutex;
-
-    k_tid_t upd_tid;
-    k_thread_stack_t *upd_stack_area;
-    struct k_thread upd_thread_data;
+    struct k_mutex read_mutex{};
+    struct k_mutex write_mutex{};
+
+    k_tid_t upd_tid{};
+    k_thread_stack_t *upd_stack_area{};
+    struct k_thread upd_thread_data{};
+
+    bool started = false;
 
 public:
 
-    BridgeClass(HardwareSerial& serial) {
+    explicit BridgeClass(HardwareSerial& serial) {
         serial_ptr = &serial;
-        transport = new SerialTransport(serial);
+    }
+
+    operator bool() const {
+        return started;
     }
 
     // Initialize the bridge
     bool begin(unsigned long baud=DEFAULT_SERIAL_BAUD) {
         serial_ptr->begin(baud);
+        transport = new SerialTransport(*serial_ptr);
 
         k_mutex_init(&read_mutex);
         k_mutex_init(&write_mutex);
@@ -67,7 +73,11 @@ class BridgeClass {
                                 UPDATE_THREAD_PRIORITY, 0, K_NO_WAIT);
 
         bool res;
-        return call(RESET_METHOD, res);
+        call(RESET_METHOD, res);
+        if (res) {
+            started = true;
+        }
+        return res;
     }
 
     template<typename F>
@@ -123,7 +133,7 @@ class BridgeClass {
     }
 
     template<typename RType, typename... Args>
-    bool call(const MsgPack::str_t method, RType& result, Args&&... args) {
+    bool call(const MsgPack::str_t& method, RType& result, Args&&... args) {
 
         uint32_t msg_id_wait;
 
@@ -165,11 +175,15 @@ class BridgeClass {
     }
 
     String get_error_message() const {
-        return (String) client->lastError.traceback;
+        return static_cast<String>(client->lastError.traceback);
     }
 
     uint8_t get_error_code() const {
-        return (uint8_t) client->lastError.code;
+        return static_cast<uint8_t>(client->lastError.code);
+    }
+
+    RpcError& get_last_client_error() const {
+        return client->lastError;
     }
 
 private:
@@ -212,8 +226,10 @@ class BridgeClass {
 
 class BridgeClassUpdater {
 public:
-    static void safeUpdate(BridgeClass& bridge) {
-        bridge.update_safe();  // access private method
+    static void safeUpdate(BridgeClass* bridge) {
+        if (*bridge) {
+            bridge->update_safe();
+        }
     }
 
 private:
@@ -222,18 +238,20 @@ class BridgeClassUpdater {
 
 BridgeClass Bridge(Serial1);
 
-void updateEntryPoint(void *, void *, void *){
-    while(1){
-        Bridge.update();
+inline void updateEntryPoint(void *, void *, void *){
+    while (true) {
+        if (Bridge) {
+            Bridge.update();
+        }
         k_msleep(1);
     }
 }
 
 static void safeUpdate(){
-    BridgeClassUpdater::safeUpdate(Bridge);
+    BridgeClassUpdater::safeUpdate(&Bridge);
 }
 
-void __loopHook(){
+inline void __loopHook(){
     k_msleep(1);
     safeUpdate();
 }

src/monitor.h

@@ -27,21 +27,27 @@
 template<size_t BufferSize=DEFAULT_MONITOR_BUF_SIZE>
 class BridgeMonitor: public Stream {
 
-private:
-    BridgeClass& bridge;
+    BridgeClass* bridge;
     RingBufferN<BufferSize> temp_buffer;
-    struct k_mutex monitor_mutex;
+    struct k_mutex monitor_mutex{};
     bool is_connected = false;
 
 public:
-    BridgeMonitor(BridgeClass& bridge): bridge(bridge) {}
+    explicit BridgeMonitor(BridgeClass& bridge): bridge(&bridge) {}
+
+    using Print::write;
 
     bool begin() {
-        return bridge.call(MON_CONNECTED_METHOD, is_connected);
         k_mutex_init(&monitor_mutex);
+
+        bool bridge_started = (*bridge);
+        if (!bridge_started) {
+            bridge_started = bridge->begin();
+        }
+        return bridge_started && bridge->call(MON_CONNECTED_METHOD, is_connected);
     }
 
-    bool isConnected() const {
+    explicit operator bool() const {
         return is_connected;
     }
 
@@ -73,9 +79,11 @@ class BridgeMonitor: public Stream {
     int peek() override {
         k_mutex_lock(&monitor_mutex, K_FOREVER);
         if (temp_buffer.available()) {
+            k_mutex_unlock(&monitor_mutex);
             return temp_buffer.peek();
         }
         k_mutex_unlock(&monitor_mutex);
+        return -1;
     }
 
     size_t write(uint8_t c) override {
@@ -84,18 +92,14 @@ class BridgeMonitor: public Stream {
 
     size_t write(const uint8_t* buffer, size_t size) override {
 
-        MsgPack::str_t send_buffer;
+        String send_buffer;
 
         for (size_t i = 0; i < size; ++i) {
-#ifdef ARDUINO
-            send_buffer += (char)buffer[i];
-#else
-            send_buffer.push_back(static_cast<char>(buffer[i]));
-#endif
+            send_buffer += static_cast<char>(buffer[i]);
         }
 
         size_t written;
-        bool ret = bridge.call(MON_WRITE_METHOD, written, send_buffer);
+        const bool ret = bridge->call(MON_WRITE_METHOD, written, send_buffer);
         if (ret) {
             return written;
         }
@@ -105,43 +109,34 @@ class BridgeMonitor: public Stream {
 
     bool reset() {
         bool res;
-        bool ok = bridge.call(MON_RESET_METHOD, res);
+        bool ok = bridge->call(MON_RESET_METHOD, res);
         if (ok && res) {
             is_connected = false;
         }
         return (ok && res);
     }
 
-    size_t write(String message) {
-        size_t size;
-        bool ok = bridge.call(MON_WRITE_METHOD, size, message);
-
-        if (!ok) return 0;
-
-        return size;
-    }
+private:
+    void _read(size_t size) {
 
-    int _read(size_t size) {
+        if (size == 0) return;
 
-        if (size == 0) return 0;
+        k_mutex_lock(&monitor_mutex, K_FOREVER);
 
         MsgPack::arr_t<uint8_t> message;
-        bool ret = bridge.call(MON_READ_METHOD, message, size);
+        bool ret = bridge->call(MON_READ_METHOD, message, size);
 
-        k_mutex_lock(&monitor_mutex, K_FOREVER);
         if (ret) {
             for (size_t i = 0; i < message.size(); ++i) {
                 temp_buffer.store_char(static_cast<char>(message[i]));
             }
-            return message.size();
         }
 
         // if (bridge.lastError.code > NO_ERR) {
         //     is_connected = false;
         // }
-        k_mutex_unlock(&monitor_mutex);
-        return 0;
 
+        k_mutex_unlock(&monitor_mutex);
     }