transport_ws: Parse and expose frame fin flag

Note: esp_websocket_client still needs patching to expose this

components/tcp_transport/include/esp_transport_ws.h

@@ -126,6 +126,16 @@ esp_err_t esp_transport_ws_set_config(esp_transport_handle_t t, const esp_transp
  */
 int esp_transport_ws_send_raw(esp_transport_handle_t t, ws_transport_opcodes_t opcode, const char *b, int len, int timeout_ms);
 
+/**
+ * @brief               Returns websocket fin flag for last received data
+ *
+ * @param t             websocket transport handle
+ *
+ * @return
+ *      - Fin flag as a boolean
+ */
+bool esp_transport_ws_get_fin_flag(esp_transport_handle_t t);
+
 /**
  * @brief               Returns websocket op-code for last received data
  *

components/tcp_transport/transport_ws.c

@@ -41,6 +41,7 @@ static const char *TAG = "TRANSPORT_WS";
 
 typedef struct {
     uint8_t opcode;
+    bool fin;                           /*!< Frame fin flag, for continuations */
     char mask_key[4];                   /*!< Mask key for this payload */
     int payload_len;                    /*!< Total length of the payload */
     int bytes_remaining;                /*!< Bytes left to read of the payload  */
@@ -382,6 +383,7 @@ static int ws_read_header(esp_transport_handle_t t, char *buffer, int len, int t
         return rlen;
     }
     ws->frame_state.header_received = true;
+    ws->frame_state.fin = (*data_ptr & 0x80) != 0;
     ws->frame_state.opcode = (*data_ptr & 0x0F);
     data_ptr ++;
     mask = ((*data_ptr >> 7) & 0x01);
@@ -711,6 +713,12 @@ esp_err_t esp_transport_ws_set_config(esp_transport_handle_t t, const esp_transp
     return err;
 }
 
+bool esp_transport_ws_get_fin_flag(esp_transport_handle_t t)
+{
+  transport_ws_t *ws = esp_transport_get_context_data(t);
+  return ws->frame_state.fin;
+}
+
 ws_transport_opcodes_t esp_transport_ws_get_read_opcode(esp_transport_handle_t t)
 {
     transport_ws_t *ws = esp_transport_get_context_data(t);