fix: restore CH390 bridge flow and sync driver docs

App/config.h

@@ -35,7 +35,7 @@ extern "C" {
 #define CONFIG_MAGIC            0x54435055
 
 /* Configuration version for compatibility */
-#define CONFIG_VERSION          0x0001
+#define CONFIG_VERSION          0x0002
 
 /* Device configuration structure */
 typedef struct {
@@ -76,13 +76,13 @@ typedef struct {
 } device_config_t;
 
 /* Default configuration values */
-#define DEFAULT_IP              {192, 168, 1, 100}
+#define DEFAULT_IP              {192, 168, 31, 100}
 #define DEFAULT_MASK            {255, 255, 255, 0}
-#define DEFAULT_GW              {192, 168, 1, 1}
+#define DEFAULT_GW              {192, 168, 31, 1}
 #define DEFAULT_MAC             {0x02, 0x00, 0x00, 0x00, 0x00, 0x01}
 #define DEFAULT_SERVER_PORT     8080
-#define DEFAULT_REMOTE_IP       {192, 168, 1, 200}
-#define DEFAULT_REMOTE_PORT     9000
+#define DEFAULT_REMOTE_IP       {192, 168, 31, 1}
+#define DEFAULT_REMOTE_PORT     8081
 #define DEFAULT_UART_BAUDRATE   115200
 #define DEFAULT_UART_DATABITS   8
 #define DEFAULT_UART_STOPBITS   1

App/tcp_client.c

@@ -106,6 +106,7 @@ static err_t tcp_client_on_connected(void *arg, struct tcp_pcb *pcb, err_t err)
 
     ctx->pcb = pcb;
     ctx->status.state = TCP_CLIENT_STATE_CONNECTED;
+    tcp_nagle_disable(pcb);
     tcp_arg(pcb, ctx);
     tcp_recv(pcb, tcp_client_on_recv);
     tcp_sent(pcb, tcp_client_on_sent);
@@ -118,8 +119,9 @@ int tcp_client_init(const tcp_client_config_t *config)
     memset(&g_client, 0, sizeof(g_client));
     g_client.config.server_ip[0] = 192u;
     g_client.config.server_ip[1] = 168u;
-    g_client.config.server_ip[2] = 1u;
-    g_client.config.server_ip[3] = 100u;
+    g_client.config.server_ip[2] = 31u;
+    g_client.config.server_ip[3] = 1u;
+    g_client.config.local_port = TCP_CLIENT_DEFAULT_PORT;
     g_client.config.server_port = TCP_CLIENT_DEFAULT_PORT;
     g_client.config.auto_reconnect = true;
     g_client.config.reconnect_interval_ms = TCP_CLIENT_RECONNECT_DELAY_MS;
@@ -148,6 +150,17 @@ int tcp_client_connect(void)
         return -1;
     }
 
+    if (g_client.config.local_port != 0u) {
+        err = tcp_bind(pcb, IP_ANY_TYPE, g_client.config.local_port);
+        if (err != ERR_OK) {
+            tcp_abort(pcb);
+            g_client.status.state = TCP_CLIENT_STATE_DISCONNECTED;
+            g_client.status.errors++;
+            g_client.next_retry_ms = HAL_GetTick() + g_client.config.reconnect_interval_ms;
+            return -1;
+        }
+    }
+
     IP_ADDR4(&remote_addr,
              g_client.config.server_ip[0],
              g_client.config.server_ip[1],
@@ -192,6 +205,11 @@ int tcp_client_send(const uint8_t *data, uint16_t len)
         return -1;
     }
 
+    if ((g_client.pcb->flags & TF_RXCLOSED) != 0u) {
+        g_client.status.errors++;
+        return -1;
+    }
+
     if (tcp_sndbuf(g_client.pcb) < len) {
         return 0;
     }

App/tcp_client.h

@@ -37,6 +37,7 @@ typedef enum {
 /* TCP Client configuration */
 typedef struct {
     uint8_t server_ip[4];       /* Server IP address */
+    uint16_t local_port;        /* Local source port */
     uint16_t server_port;       /* Server port */
     bool auto_reconnect;        /* Auto reconnect on disconnect */
     uint16_t reconnect_interval_ms; /* Reconnect interval */

App/tcp_server.c

@@ -104,6 +104,8 @@ static err_t tcp_server_on_accept(void *arg, struct tcp_pcb *newpcb, err_t err)
     ctx->status.state = TCP_SERVER_STATE_CONNECTED;
     ctx->status.connections++;
 
+    tcp_nagle_disable(newpcb);
+
     tcp_arg(newpcb, ctx);
     tcp_recv(newpcb, tcp_server_on_recv);
     tcp_sent(newpcb, tcp_server_on_sent);
@@ -189,6 +191,11 @@ int tcp_server_send(const uint8_t *data, uint16_t len)
         return -1;
     }
 
+    if ((g_server.client_pcb->flags & TF_RXCLOSED) != 0u) {
+        g_server.status.errors++;
+        return -1;
+    }
+
     if (tcp_sndbuf(g_server.client_pcb) < len) {
         return 0;
     }