SMS Brokers in Java

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HTTPObjUrl = "http://wwwsms-wapcom/cgi/csendcgi" HTTPObjPostData = "UID=" & HttpObjURLEncode(UID) & "&" & _ "PW=" & HttpObjURLEncode(PW) & "&" & _ "N=" & HttpObjURLEncode(N) & "&" & _ "M=" & HttpObjURLEncode(M) HTTPObjRequestMethod = "POST" ' Send the message sending request to the server HTTPObjGetURL %> This is all rather straightforward Web programming Things get a little more challenging when you want to get out of couch-potato mode and interact with the mobile The one-way mode can blast out alerts, horoscopes, and the joke of the day, but is doesn t allow the recipient to reply (Of course, for the joke of the day, you might not want to answer!) The real value in SMS messaging is two-way communication, and doing this by way of an SMS broker requires some additional moving parts Because you are really using the broker s GSM account and telephone number, any reply to messages sent through them obviously will come back to that account If the broker has more customers than just you and you certainly hope he does because you and the other customers share the cost of running the brokerage then there has to be a way for the broker to figure out which of his customers should receive the incoming SMS reply Now the broker could keep track of who sent the outgoing message so that, when the reply came back, he d just send it to you, but doing so would require a massive database and this approach breaks down if two or more people are using the broker to send messages to the same mobile NovelSoft has set up a clever service that lets you register one or more keywords that are unique to you When a message comes in from a mobile that starts with one of your keywords, they send a GET containing the message to a Web server that you ve associated with the keyword You process the message on your Web server, and whatever you respond to NovelSoft s GET they send back to the mobile
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SMS Brokers
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For example, I have registered the keyword MM (for mobile mind) with NovelSoft If I send you a message out through NovelSoft, it will arrive at your mobile as if it came from their mobile phone, which in the spring of 2001 had the phone number 41 4002030 If you now respond to this message but start your message with the letters MM, it will go via the GSM SMS back to 41 4002030, where NovelSoft will see the MM and send a GET of the message along with your mobile number to http://wwwmobile-mindcom/mmasp Presto, chango, we are in two-way communication Of course, this works the same way if you rather than I initiate the conversation That is, if you send an SMS message out of the blue to 41 4002030 that starts with MM, then NovelSoft is going to send the GET, and we re off to the races To illustrate how this all works, let s build a little m-commerce server This is going to be a state-of-the-art, multistep application like the database application we used in 4 In this setup, your customers have been preidentified and have established credit with you They have chosen PINs and told you the telephone number from which they will be placing their orders Further, the orders are from a small, well-defined, and static catalog so customers only have to provide the catalog numbers of the products they want This setup is perfect, for example, for placing standing refill orders for one of a small number of standard items: Send me my usual reorder of Lava Soap No need for your customer to chat on the phone or interact with your Web page Three quick SMS messages while waiting at the traffic light and they ve placed the order directly into your order entry system and driven on This order process is illustrated in Figure 5-3 The customer starts the conversation by sending in his or her PIN This establishes a connection between (knowledge of) the PIN and the phone sending it and thus authenticates the customer You actually could consider eliminating this step and just authenticate the customer with the phone number Adding the PIN provides greater security The start message looks like this: MM PIN 1234 After checking to make sure the PIN goes with phone number of the sender, our little m-commerce server responds with: BUY OR CHK
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