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If the result returned is true, it means that no error occurred when receiving the command, and the cmd variable, passed as an argument, contains the command sent by the master NXT; so, the first branch of the if structure is taken The slave sends a first ack ACK_RX to the master, meaning Hey, I got the message correctly! Then it displays information onscreen by calling the ShowRxCommand(cmd) function, it executes the command with ExecuteCommand(cmd), and after that sends another ack ACK_DONE to the master, to say I ve executed your command! The reason for using two different acks is to inform the master about both reception and execution of the command So, the master can choose to wait for the remote operation s completion (signaled by the ACK_DONE ack), or to go on with its own task after having sent the command.

The next step is to add the methods for retrieving the data: ReadCustomerData and ReadCustomerDataFromServer. The ReadCustomerData method will determine if the server is available via the TestWebServer, and determine the appropriate way to retrieve the customer data. The ReadCustomerDataFromServer method will create the web service proxy object and retrieve the data from the web service. This is shown in Listing 10-14. Listing 10-14. Adding the ReadData and ReadDataFromServer Methods namespace ACME.POS.Service.Client { public class OfflineManager { private string m_Url; private bool TestWebServer(string Url, int Timeout)... private string GetUrl...

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try { // Here we use just the language part of the locale: // the country part isn't relevant since this game // doesn't display prices. locale = locale.substring(0, 2); // Attempt to load the label strings // in the correct language: StringBuffer buff = new StringBuffer("/"); buff.append(locale); buff.append(".properties"); is = this.getClass().getResourceAsStream(buff.toString()); } catch(Exception e) { // If the handset's language is not present, // default to English: locale = "en"; is = this.getClass().getResourceAsStream("/en.properties"); } myLabels = new Properties(is, null); // Since some of the labels are drawn as images, // here we load label images for the correct language. // At the same time, load all of the graphical properties // for the given screen size: StringBuffer buff = new StringBuffer("/"); buff.append(locale); // Here only two screen sizes are implemented, but this // could easily be extended to support a range of sizes: if((myWidth > 250) || (myHeight > 250)) { is = this.getClass().getResourceAsStream("/large.properties"); myProperties = new Properties(is, null); buff.append("_large.properties"); is = this.getClass().getResourceAsStream(buff.toString()); } else { is = this.getClass().getResourceAsStream("/small.properties"); myProperties = new Properties(is, null); buff.append("_small.properties"); is = this.getClass().getResourceAsStream(buff.toString()); } myLabelImage = myProperties.getImage(locale); myLabelImages = new Properties(is, myLabelImage); // Last, see if we can create custom softkeys // instead of using lcdui commands: try { // Get the system property that identifies the platform: String platform = System.getProperty("microedition.platform").substring(0,5); // check if the platform is one that we have softkey // codes for:

To tell the master to repeat the last message, the slave can send a third kind of ack, ACK_ERR, if the ReceiveHSNumber function returned false, meaning that some error occurred (else branch) The Remote function (inside the J5_commnxc file), used by the master program to send commands to the slave, can thus exploit the information carried by these different acks to implement a simple error detection and correction protocol The last thing done before closing the loop in main is to invoke the system call SysKeepAlive With that, you reset the firmware s sleep timer, and you can avoid the annoying issue that causes the NXT to turn off right in the middle of play, even if the program is running! I once heard about a LEGO sumo competition lost by a robot that had this kind of problem.

public Customer[] ReadCustomerData() { string url = GetUrl; Customer[] customers; //check to see if server is available if (TestWebServer(url, 10)) { customers = ReadCustomerDataFromServer(url); } else { CacheManager cache = CacheFactory.GetCacheManager(); customers = cache.GetData("customers") as Customer[]; } return customers; } private Customer[] ReadCustomerDataFromServer(string url) { CustomerServices service = new CustomerServices(); service.Url = url; return service.GetCustomerList(); } } }

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