TCP Server: update timer after client write

Author: PaulZC

Firmware/RTK_Everywhere/TcpServer.ino

@@ -120,7 +120,7 @@ static const char * tcpServerName;
 static volatile uint8_t tcpServerClientConnected;
 static volatile uint8_t tcpServerClientDataSent;
 static volatile uint8_t tcpServerClientSendingData;
-static uint32_t tcpServerClientTimer[TCP_SERVER_MAX_CLIENTS];
+static volatile uint32_t tcpServerClientTimer[TCP_SERVER_MAX_CLIENTS];
 static volatile uint8_t tcpServerClientWriteError;
 static NetworkClient *tcpServerClient[TCP_SERVER_MAX_CLIENTS];
 static IPAddress tcpServerClientIpAddress[TCP_SERVER_MAX_CLIENTS];
@@ -168,9 +168,12 @@ int32_t tcpServerClientSendData(int index, uint8_t *data, uint16_t length)
         length = tcpServerClient[index]->write(data, length);
         if (length > 0)
         {
-            // Update the data sent flag when data successfully sent
+            // Update the data sent flag and timer when data successfully sent
             if (length > 0)
+            {
                 tcpServerClientDataSent = tcpServerClientDataSent | (1 << index);
+                tcpServerClientTimer[index] = millis();
+            }
             if ((settings.debugTcpServer || PERIODIC_DISPLAY(PD_TCP_SERVER_CLIENT_DATA)) && (!inMainMenu))
                 systemPrintf("%s wrote %d bytes to %s\r\n",
                              tcpServerName, length,