Making Things Talk

COMMUNICATING IN (NEAR) REAL TIME 159

Next, take action depending on the

state of the client and the messages to

be sent:

8

void stateCheck() {

// Everything in this method depends on the client's status:

switch (status) {

case connected:

// if you're connected, listen for serial in:

while (Serial.available() > 0) {

// if you get a 'D', it's from the Lantronix device,

// telling you that it lost the connection:

if (Serial.read() == 'D') {

status = disconnected;

}

}

// if there's a paddle message to send, send it:

if (paddleMessage != 0) {

Serial.print(paddleMessage);

// reset paddleMessage to 0 once you've sent the message:

paddleMessage = 0;

}

// if there's a connect message to send, send it:

if (connectMessage != 0) {

// if you're connected, disconnect:

Serial.print(connectMessage);

// reset connectMessage to 0 once you've sent the message:

connectMessage = 0;

}

break;

case disconnected:

// if there's a connect message, try to connect:

if (connectMessage !=0 ) {

deviceConnect();

// reset connectMessage to 0 once you've tried to connect:

connectMessage = 0;

}

break;

// if you sent a connect message but haven't connected, keep trying:

case connecting:

// read the serial port:

if (Serial.available()) {

inByte = Serial.read();

// if you