enum TRSmsCmdCode { ERSmsCmdNone = 0, // Reserved for internal usage in .NET

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enum TRSmsCmdCode { ERSmsCmdNone = 0, // Reserved for internal usage
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ERSmsCmdQueryVersion = 1, // Query version ERSmsCmdVersionReply = 2, // Version reply ERSmsCmdGetAllSms = 10, ERSmsCmdGetMoreSms = 11, ERSmsCmdGetSmsById = 12, ERSmsCmdReceiveSms = 13, ERSmsCmdReceiveNoMoreSms // Get messages in Inbox or folder // Get remaining messages from Inbox or folder // Get one message by identifier // Receive one or more SMS = 14, // Got no more messages
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ERSmsCmdReturnEvents = 20, // Return message events ERSmsCmdMsvEvent = 21, // Message created etc. event ERSmsCmdSendSms = 30, // Send a message ERSmsCmdSentSms = 31, // Message has been sent ERSmsCmdDeleteSms = 40, // Delete a message ERSmsCmdDeletedSms = 41, // Message has been deleted ERSmsCmdError = 50 // An error has occurred };
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As you can see, we have some boiler-plate codes the no-op and the version query code. We have also included an error response ERSmsCmdError, as it is possible that any command may prompt an error. The SMS-related commands are as follows: ERSmsCmdGetAllSms get all SMS messages in a folder ERSmsCmdGetMoreSms get any unfetched SMS messages ERSmsCmdGetSmsById get one SMS by index identi er ERSmsCmdSendSms create and send an SMS ERSmsCmdDeleteSms delete an SMS We have provided a command to get all the SMS messages from any folder, but we have also allowed for the fact that we may not be able to get all the SMS messages that we want in one response. When programming for an embedded device such as a smartphone, we can never assume that we can have an arbitrarily large buffer for a PDU. Any protocol that ignores the question of maximum PDU size is a good way to crash the smartphone. We assume later that the data for any single SMS can be tted in a PDU. This is probably safe, given the limited size of an SMS, although if we concatenated suf cient messages together we could break any limit. If we were dealing with email messages with attachments then we would not be able to make this assumption and we would have to handle breaking messages across PDUs. The delete and send SMS commands are clearly useful, and the command to fetch one SMS by itself will be useful when we handle events. When a new SMS arrives, we do not want to have to fetch all the other messages at the same time.
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The response codes are also fairly obvious. I have chosen to de ne a response code for no more messages, but we could have sent just an empty set of messages. The reason for the event command and response will become clear later, but, for now, note that the ERSmsCmdReturnEvents command puts a stream or session into an event handling mode. Note that the actual values used for the command opcodes and response codes are arbitrary. We could have spread the values out or reserved one bit for responses, but these values are good enough for now. As well as de ning opcodes, etc., we need to de ne the maximum packet size. Normally, we would set this as big as we can afford, but for this example we will set it smaller so that we can test fetching more SMS messages than will t into one packet. Some of the commands (ERSmsCmdNone, ERSmsCmdQueryVersion, ERSmsCmdGetMoreSms and ERSmsCmdReturnEvents) need no further arguments, but the others need one or more additional arguments. The ERSmsCmdFetch, ERSmsCmdGetSmsById and ERSmsDeleteSms commands each need a single identi er. The ERSmsCmdSendSms command is the one command that requires a lot of data. We will pack all the data required to create and send the SMS into one command. We could implement some form of storage of draft messages and then edit them, but we might as well implement that on the PC side if we need it. The response PDUs follow a similar pattern. The ERSmsCmdError PDU has a four-byte error number (a standard Symbian OS error code). The ERSmsCmdSentSms and ERSmsCmdDeletedSms PDUs include a single four-byte message index identi er the newly sent message or the newly deleted message respectively. The ERSmsCmdReceiveNoMoreSms PDU needs no extra data it just signi es that all messages from the last speci ed get request have been returned. The ERSmsCmdVersionReply PDU includes standard version and build data. The ERSmsCmdMsvEvent PDU includes a series of sets of event data. These include the event type and the relevant message index identi ers. The ERSmsCmdReceiveInitialSms and ERSmsCmdReceiveMoreSms messages are the complex PDUs, as they include one or more SMS messages with all details. Query Version Command
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Field Opcode Transaction ID Type Int32 Int32 Meaning ERSmsCmdQueryVersion (=1) PDU transaction identi er
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