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INF245 Mobile applications Mobile and wireless message exchange

INF245 Mobile applications Mobile and wireless message exchange. MM chapter 5 also builds upon Michael Juntao Yuan(2004) Enterprise J2ME: kap 8, 9,10 HiM Fall 2007. Many types E-mail SMS WAP-push (EMS) MMS App to App. Messaging is asynchronous communication Push vs. Pull

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INF245 Mobile applications Mobile and wireless message exchange

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  1. INF245 Mobile applicationsMobile and wireless message exchange MM chapter 5also builds upon Michael Juntao Yuan(2004) Enterprise J2ME: kap 8, 9,10 HiM Fall 2007 Molde University College INF 245 Fall 2007 OBø

  2. Many types E-mail SMS WAP-push (EMS) MMS App to App Messaging is asynchronous communication Push vs. Pull Push- messages come without request from the mobile device. Pull means that the device asks the server if a message has arrived Messages generally Molde University College INF 245 Fall 2007 OBø

  3. E-mail • Probably the single most used application on the Internet • The e-mail reader often contains PIM functionality • e-mail operation, see figure • E-mail is important on mobile devices, but there are problems: • Long messages • Spam • Where does the message end if you have several machines/e-mail clients • Solutions • IMAP-servers support the storage of e-mail on the mail server and gives betters support for stationary/mobile e-mail management • http://www.imap.org/papers/imap.vs.pop.brief.html • A third alternative is web-mail. Here the messages are also stored on server. • MJY fig. 8.1 Fra Yuan (2004) Molde University College INF 245 Fall 2007 OBø

  4. SMS • Introduced in 1991 as a part of the GSM-standard • Considerable success • Max length is 160 letters (70 in Chinese) • Advantages • ”Guaranteed” delivery using store and forward • Easy to use? • Low cost? • Major income for the service supplier • Consumers: Peer to peer and information services • Business: Positioning, Work orders, Remote reading Molde University College INF 245 Fall 2007 OBø

  5. Group discussion • Give six examples of SMS services as interesting as possible Molde University College INF 245 Fall 2007 OBø

  6. Finland 2002 Ring tones 24% Consumption control16% Logos 14% Catalogue services 10% TV-chat 7% 3 finish TV canals mean user is a female 22 years old Others 29 % Goods tracing Travel information Cab reservation Buying tram tickets Who owns the car? Amount in my bank account SMS-services Molde University College INF 245 Fall 2007 OBø

  7. SMS-character set More technical information can be found here: http://www.dreamfabric.com/sms/ Molde University College INF 245 Fall 2007 OBø

  8. SMS in a system context • Simple sending and reception from devices in mobile networks • Sending and receiving from outside the mobile network using a proprietary interface in SMSC • MO = Mobile Originated • MT= Mobile Terminated • Three technical solutions for SMS service delivery • By agreement with the network operator • For example: Telenor SMS Aksess • Protocols: Telocator Alphanumeric Protocol (TAP)Short Message Point to Point • By agreement with aggregator. The Aggregator gives access to all relevant networks • PSWIN http://www.pswin.com/ • Simplewirehttp://simplewire.com • Dataguard http://www.dataguard.no • SMS can be sent using e-mail (smtp), http etc. • SMS by using a connected mobile phone or a gprs- or umts- card– for example Nokia D211 Molde University College INF 245 Fall 2007 OBø

  9. Renting a gateway • Relatively expensive • A cheaper solution is using a phone or a phone card • But commercial gateways have advantages • Short-numbers as 1980, 2180, etc. is possible • (a dedicated short number is very expensive) • Overtaxing SMS for commercial purposes is possible to avoid loosing money by sending sms • Many and flexible interfaces for SMS • Possible to send data in binary format using SMS • High availability Molde University College INF 245 Fall 2007 OBø

  10. Using a gateway from PSWin • Provides interfaces between application as SMS • Several interfaces • SMTP • HTTP • ActiveX/Com • More… Molde University College INF 245 Fall 2007 OBø

  11. Developing for the PSWin gateway • PSWin supplies a dedicated ActiveX/COM-component for using the gateway in ActiveX-compatible development tools and a dedicated client for for .NET-programs. • HTTP-interface permits simple connection from most programming environments using HTTP POST-requests. Molde University College INF 245 Fall 2007 OBø

  12. Sending messages using the HTTP-interface • Sending messages is used by sending a HTTP- request to the PSWin server. Main Request parameters: • USER – user name for the PSWin account • PW – password for the account • RCV – receivers phone number. • SND – senders phone number as shown in the message • CT - content-type (1 for text • TXT – URL-encoded message content • OBS: • Parameter names are case sensitive • Country code (47 for Norway) must be present in the phone number • Phone number can only contain digits (no spaces or + in front of country code) Molde University College INF 245 Fall 2007 OBø

  13. Sample request to send a message POST /http4sms/send.asp HTTP/1.0Host: sms.pswin.comContent-type: application/x-www-form-urlencodedContent-length: 87USER=demo&PW=password&RCV=4711223344&TXT=Please+send+me+a+copy+of+the+datamodel.+Rgds,+John Molde University College INF 245 Fall 2007 OBø

  14. Reception of messages using the HTTP-interface • Messages are received making a HTTP POST-request to your server • Server address manually configured by PSWin. • Main request parameters are: • SND - Senders phone number • TXT – Text message content (URL-encoded) • OBS: The code-word is included in the received message Molde University College INF 245 Fall 2007 OBø

  15. Sample received message request to your server POST /receive.asp HTTP/1.0Host: youserver.comContent-type: application/x-www-form-urlencodedContent-length: 45RCV=37774757&SND=4712345678&TXT=testing%20SMS Molde University College INF 245 Fall 2007 OBø

  16. Group discussion • Design the dialogue for an SMS service to request exams results • The service should serve the students of a number of colleges and universities. • It must be possible to order • a message as soon a new result is available • a message reporting all results so far • How do you ensure that only the student can get to his own results Molde University College INF 245 Fall 2007 OBø

  17. Multimedia Pictures, Text and Sound Audio and video Presentations Immediate or "Store and Forward" Also supports using e-mail addressing Standardized by OMA and 3GPP MMS is transported using WAP No size limitations 30-100kB in practice in 1. generation Messages are sent via a MMSC – MMS Center 1. generation is formatted as a slide show with image and text Video, Audio and Text files can be connected to a slide using SMIL (Synchronized Multimedia Integration Language) en W3C XML-standard MMS Multimedia Messaging Service Molde University College INF 245 Fall 2007 OBø

  18. <smil> <head> <layout> <root-layout width="176" height="208"/> <region id="Image" width="160" height="120" top="5" left="8" fit="meet"/> <region id="Text" width="160" height="73" top="130" left="8" fit="scroll"/> </layout> </head> <body> <par dur="5000ms"> <text region="Text" src="Dette_er.txt"/> </par> <par dur="5000ms"> <audio src="Lydklipp.amr"/> <img region="Image" src="Bilde_09.jpg"/> </par> </body> </smil> Molde University College INF 245 Fall 2007 OBø

  19. Aften-posten Molde University College INF 245 Fall 2007 OBø

  20. Abonnenter: Det er 5,2 millioner mobilabonnementer i Norge, en økning på syv prosent fra i fjor. Mobiltrafikk: Mobiltrafikken første halvår 2007 økte med 21 prosent fra samme periode i fjor. Prating: Vi snakket i gjennomsnitt 2,4 timer i måneden fra januar til juli. Det er en økning på 18 minutter i måneden fra i fjor. Totalt snakket vi 76 millioner timer i mobiltelefon på årets seks første måneder. Det tilsvarer 3,2 millioner døgn. Tekstmeldinger: Vi sendte over tre milliarder meldinger på mobilen første halvår i år (inkl. MMS og innholdsmeldinger), det er en økning på 12 prosent. I gjennomsnitt sendte norske mobilkunder 99 meldinger pr. måned. Det er fem meldinger flere enn på samme tidspunkt i fjor. MMS-meldinger: Vi sendte 51 millioner MMS-meldinger fra januar til juli. Det er to prosent av det totale antall meldinger og har ikke økt siden i fjor. Mobilen overtar: Mobiltrafikk sto for 46 prosent av samlet trafikkvolum (fastnett og mobilnett) fra januar til juli 2007. I fjor var tallet 38 prosent og bare 28 prosent for to år siden. Nedgang : Til tross for økning i mobilbruk, er nedgangen i bruk av fasttelefon så merkbar at totaltrafikken gikk ned med fem prosent fra første halvår i fjor. Kilde: Det norske telekommarkedet 1. halvår 2007. Post- og teletilsynet. Slik er det ellers i Norden Sverige: Hadde ved utgangen av 2006 9,6 millioner mobilabonnement. Snakker 1,8 timer i mobil i måneden og sender 25 meldinger i måneden i snitt. Danmark: Hadde ved utgangen av 2006 5,8 millioner mobilabonnement. Snakker 1,8 timer i mobil i måneden og sender hele 150 meldinger i måneden i snitt. Finland: Er mobilvinneren. Hadde 5,6 millioner mobilabonnement ved utgangen av 2006. Snakker 3,1 timer i måneden i mobil og sender 47 meldinger i måneden i snitt PS! Tall fra desember 2006. Aftenposten Molde University College INF 245 Fall 2007 OBø

  21. Group discussion • Why has the use of MMS not augmented? • How can the operators influence this? • What applications can you see for MMS? Molde University College INF 245 Fall 2007 OBø

  22. e-mail attachments ordering in folders spam durability infrastructure SMS limited length pros and cons infrastructure SMS vs. e-mail Molde University College INF 245 Fall 2007 OBø

  23. MMS –development using Nokia Mobile Server Services SDK • Used to develop backend-solutions for MMS • Nokia Mobile Server Services Emulator • Nokia Mobile Server Services API and Library • MMS device emulator Molde University College INF 245 Fall 2007 OBø

  24. Instant messaging • 100 mill users of desktop IM in 2003... what about mobile IM? • Presence an important element • IMPS= Instant Messaging and Presence Service • Elements of presence • Connected/Status/Mood • Localization • Not store and forward • Interoperability problems between solutions, • Mobile instant messaging clients: AOL, Microsoft, Openwave. • There are also clients that can use several IMS: http://www.agilemobile.com • JSR 164 og JSR 165 standardises IM og Presence using SIP (Session Initiation Protocol) Molde University College INF 245 Fall 2007 OBø

  25. WAP-Push • Protocol to send messages to a device • Handled by wap-reader • Architecture is defined in WAP push framework • PAP transfers message using XML • Possible operations: Push, Submit, Cancel, Replace • Status and Client Capability Query • Response is in XML figur 5.2 Molde University College INF 245 Fall 2007 OBø

  26. App to App messaging • A software layer called Message Oriented Middleware (MOM) handles the message exchange • MOM example: JMS (Java Messaging Service) • Advantages • Universal integration using standardized messages that can be sent regardless of receivers state • Better reliability – delivery guaranteed • Better scalability: the server is not busy maintaining a considerable number of passive connections • Quality of service – it is possible to handle messages in order of priority Molde University College INF 245 Fall 2007 OBø

  27. Mobile MOM • Messages are being handled by Messaging Middleware Servers • Server functionality is specified in JMS • Two models: • Publish-subscribe • Point to point • Commercial MOM for mobile applications: • Mobile JMS from iBus//Mobile • Servers on gateway • light weight clients on mobile devices (J2ME, SMS, WAP) • IBM Websphere MQ Everyplace • Mobile MOM-server • Compression and encryption • Available for Windows Mobile, Symbian and under WebSphere Micro Environment PersonalJava • Servers are not available for CLDC/MIDP, but a client is Fra Yuan (2004) Fra Yuan (2004) Molde University College INF 245 Fall 2007 OBø

  28. Molde University College INF 245 Fall 2007 OBø

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