TCPClient Panic when in SEMI_AUTOMATIC wireless mode

Troubleshooting
21

Thanks for your advice @Dave

Edit: Actually I did what you told me to start with a simple code, and I do see @digixx code in this thread:

and it worked like a charm for me, so I could see the "Hello" output on the client's serial output. Then I modified my server code to be like this:

// Thanks for @Scruff and @BDub
#include "application.h"
#include "Serial2/Serial2.h"

SYSTEM_MODE(SEMI_AUTOMATIC);
TCPServer server = TCPServer(9999);
TCPClient client;
const int wakePin = D0;  // use Serial2 RX pin as wake pin
char szReceive[64] = { '\0' };
int idx = 0;
uint32_t ms;
uint32_t msPublish;
uint32_t msLastSerial;
bool frameStart = false;

void setup()
{
  server.begin();
  Serial.begin(19200);
  Serial2.begin(19200);
  while(!Serial.available()) SPARK_WLAN_Loop();
  msLastSerial = millis();
}

void loop()
{
    int d = Serial.read();
    switch (d) {
      case 'W': 
      {
            WiFi.connect();
            delay(500);
            break;
      }
      case 'C':
      {
           Spark.connect();   
            break;
      }
    } // end of switch
    ms = millis();
    Serial2.flush();
    idx = 0;
    while (idx < 38 && millis() - ms < 1000 )
    {
if(Serial2.available())
        {
            msLastSerial = millis();
            char c = Serial2.read();
            Serial.write(c);
            if (c == 'S')
            { 
                frameStart = TRUE;
                idx = 0;
            } // end of if (c=='S')

            if (frameStart)
            {
                szReceive[idx++] = c;
                szReceive[idx] = '\0';
            } // end of if (frameStart)
        } // end of if(Serial2.available())
    } // end of while
    if (idx >= 38 && millis() - msPublish > 1000)
    {
        Serial.println(szReceive);
        if (client.connected()) 
   {
   server.write(szReceive);
       while (client.available()) 
         {
            Serial.print("a"); // ooh, the client has send some data
            server.write(client.read()); // just send back whats received
         }
    } //end of if (client.connected())
    else    
            {
        // if no client is yet connected, check for a new connection
            client = server.available();
            } //end of else
        if (Spark.connected())
        {
        Spark.publish("Carpet1",szReceive,PRIVATE);
        } // end of if (Spark)
        msPublish = millis();
        idx = 0;
        frameStart = FALSE;
    } // end of if (idx)
    if (millis() - msLastSerial > 5000)   // stay awake 5 sec after last serial byte
    Spark.sleep(wakePin, RISING);
} // end of void

And the client code to be like this:

// Thanks for  @BDub
#include "application.h"
SYSTEM_MODE(SEMI_AUTOMATIC);
void tcp_connect();
byte server[] = { 192, 168, 1, 104 }; // Server
TCPClient client;
void setup()
{
  Serial.begin(19200);
  while(!Serial.available()) SPARK_WLAN_Loop();
  Serial.println("Please Enter Your Character Input:");
 }

void loop()
{
   if (client.connected())
  {
char x = client.read();
        Serial.print(x);
            }
  if (Serial.available()) {
    int c = Serial.read();
      switch (c) {
            case 'W': 
      {
          WiFi.connect();
          delay(500);
          Serial.println("The client is connected to the router");
          break;
      }
      case 'T': tcp_connect(); break;
      case 'C':
      {
       Spark.connect();
       delay(500);
       Serial.println("The client is connected to the Spark Cloud");
       break;
       }
  }   //end of switch
 }  //end of serial check

}
void tcp_connect() {
  Serial.println("connecting...");
  if (client.connect(server, 9999))
  {
    Serial.println("connected to Server 192.168.1.104");
    Serial.println("The below data is sent from the client to the server");
     }
  else
  {
    Serial.println("connection failed");
  }
}

For now, I can see the output on the Server serial side as show below:

but on the Client serial side it looked like this:

Please @Dave, @ScruffR, @BDub do you know why I'm seeing these spaces at the client serial side? Also, if I want to capture the output at the client serial, I'm seeing these weird characters with the actual data:

Does this weird character (or spaces) is because I'm doing Serial2.flush();? Or it is error in somewhere else in the firmware?
Thanks in advance.

22

Reread Dave’s code and look where you have not done what he suggested.

Once you lockated the error, think why this made the difference you saw (BTW: Screenshot 2 and 3 do tell you the same story).

1 Like
23

Aha, I think you mean that I should move the if (client.available()); outside the (serial.available());, since it will only check the TCP socket for the incoming data if there is also data on the serial buffer at the same time. That’s what you mean right? I’ll try to change that in the client’s code, and see if this will solve the issue. Thanks for your notice @ScruffR