Added PURGE_DATA

serial/serbridge.c

@@ -44,6 +44,8 @@ serbridgeConnData connData[MAX_CONN];
 #define SetDataSize  2  // Set data size
 #define SetParity    3  // Set parity
 #define SetControl   5  // Set control lines
+#define PurgeData   12  // Flush FIFO buffer(s)
+#define PURGE_TX     2
 #define BRK_REQ      4  // request current BREAK state
 #define BRK_ON       5  // set BREAK (TX-line to LOW)
 #define BRK_OFF      6  // reset BREAK
@@ -54,7 +56,7 @@ serbridgeConnData connData[MAX_CONN];
 
 // telnet state machine states
 enum { TN_normal, TN_iac, TN_will, TN_start, TN_end, TN_comPort, TN_setControl, TN_setBaud,
-    TN_setDataSize, TN_setParity };
+    TN_setDataSize, TN_setParity, TN_purgeData };
 static char tn_baudCnt;
 static uint32_t tn_baud; // shared across all sockets, thus possible race condition
 static uint8_t tn_break = 0;  // 0=BREAK-OFF, 1=BREAK-ON
@@ -114,9 +116,18 @@ telnetUnwrap(serbridgeConnData *conn, uint8_t *inBuf, int len)
       case SetDataSize: state = TN_setDataSize; break;
       case SetParity: state = TN_setParity; break;
       case SetBaud: state = TN_setBaud; tn_baudCnt = 0; tn_baud = 0; break;
+      case PrugeData: state = TN_purgeData; break;
       default: state = TN_end; break;
       }
       break;
+    case TN_purgeData:              // purge FIFO-buffers
+      switch (c) {
+        case PURGE_TX:
+          // TODO: flush TX buffer
+          break;
+      }
+      state = TN_end;
+      break;
     case TN_setControl:             // switch control line and delay a tad
       switch (c) {
       case DTR_ON: