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updated readme
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Jesse Young
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README.txt
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README.txt
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(Polling branch - this adds periodic URL polling functionality)
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========
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Contents
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========
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KalSMS is an simple Android SMS gateway application.
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* About KalSMS
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* Features
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* Prerequisites
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* Installing
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* Server API
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* License
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Info & setup here: http://wiki.github.com/niryariv/kalsms/
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============
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About KalSMS
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============
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The code is released under the MIT license. Please contact niryariv@gmail.com with any questions or feedback.
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KalSMS is an Android app that acts as a SMS/MMS gateway.
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For more information, see http://youngj.github.com/KalSMS/
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========
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Features
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========
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* Can be deployed almost anywhere in the world
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* Designed to allow non-technical users to do all setup/maintenance
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of deployed phones
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* Many different phones running KalSMS can be connected to a single server
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(each phone could forward messages for a different mobile network)
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* Authenticates with password shared between phone and server
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* Retries forwarding messages after a delay if there is an error
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(e.g. due to temporarily broken internet or GSM connection)
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* Notifies the server of the status of outgoing messages
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* Forwards incoming MMS messages (pictures/video/audio)
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* Shows log messages to user to facilitate troubleshooting
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* Can prevent incoming messages from being stored in Messaging inbox
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* Can forward messages already received in Messaging inbox
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=============
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Prerequisites
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=============
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* One or more Android phones (1.6 Donut or higher) that are
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registered on a mobile network.
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* A way for the phones to connect to the internet, either via Wi-Fi
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or the mobile data service. (Even if using Wi-Fi, mobile data
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service is required for receiving MMS messages.)
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* A web server accessible from the public internet
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==========
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Installing
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==========
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The general process for installing KalSMS is as follows:
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* Download and install KalSMS on an Android phone, e.g. via
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http://envaya.org/sg/kalsms or by compiling it from source
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and using "adb install" on a phone in USB debugging mode
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* Open the KalSMS app
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* Click the Menu button, then "Settings"
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* Configure KalSMS to work with your server by entering:
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* your server URL
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* your phone number
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* the password shared with the server
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* Choose an interval to poll for new messages
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* Check "Enable KalSMS?"
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* Click the Back button to return to the main screen
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Of course, you must also set up the server. It is assumed that
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you already have some kind of HTTP server; follow the instructions in the
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Server API section below to learn how to construct a resource that
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communicates with KalSMS.
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To test if KalSMS has been configured properly and can connect
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to your server, open the KalSMS app, click the Menu button,
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then click "Test Connection".
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Additional recommended phone configuration:
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* Prevent Wi-Fi from turning off when the phone sleeps, by
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going to Settings > Wireless & Networks > Wi-Fi settings >
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Menu key > Advanced > Wi-Fi sleep policy and select "Never".
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(Otherwise, you will get connection timeout errors when forwarding
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messages after the phone goes to sleep.)
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==========
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Server API
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==========
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KalSMS communicates with the server via HTTP POST requests which expect an XML response.
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For convenience, KalSMS includes server libraries for certain languages to simplify
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handling its POST requests and generating response XML.
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These libraries and example code are available in the server/ directory.
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-------------------
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HTTP Request Format
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-------------------
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The following parameters are sent by all POST requests from KalSMS:
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"version" ::= <integer>
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The API version of the POST requests (currently "2").
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This number will be incremented whenever the format of POST requests changes significantly.
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This allows the server to support phones running different API versions at the same time.
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If a deployment has many phones running with KalSMS, the server should update its code first,
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then the phones can be upgraded to the new version of KalSMS as convenient.
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"phone_number" ::= <text>
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The phone number of the phone running KalSMS, as entered under Menu > Settings.
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This allows the server to differentiate between KalSMS clients if multiple phones
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are running KalSMS.
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"action" ::= "outgoing" | "incoming" | "send_status"
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The request action determines the purpose of the HTTP request:
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"outgoing":
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Poll the server for outgoing messages
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"incoming":
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Forward an incoming SMS or MMS message to the server
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"send_status":
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Update the server on the status of sending an outgoing message
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The other POST parameters sent depend on the request action.
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HTTP Headers sent by all POST requests from KalSMS:
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"X-Kalsms-Signature" ::= <text>
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A signature of the request to verify the phone and the server share the same password
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(though it doesn't protect against MITM snooping or replay attacks).
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The signature is calculated by the following algorithm:
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1. Sort all POST parameters (not including file uploads)
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in alphabetical order by the name of the field.
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2. Generate an input string by concatenating:
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the server URL,
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each of the sorted POST parameters with their corresponding values, and
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the password,
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with a comma in between each element, like so:
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"<serverURL>,<name1>,<value1>,<...>,<nameN>,<valueN>,<password>"
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3. Generate the SHA-1 hash of the input string in UTF-8
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4. Encode the SHA-1 hash using Base64 with no line breaks.
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Additional parameters sent in POST requests with action=incoming:
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"from" ::= <text>
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The phone number of the message sender.
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"message_type" ::= "sms" | "mms"
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Whether this message is an SMS or MMS.
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"message" ::= <text>
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The message body of the SMS, or the content of the text/plain part of the MMS.
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Additional parameters sent in POST requests with action=incoming and message_type=mms:
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"mms_parts" ::= <json_array>
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Metadata for each part of the MMS. Each item in the JSON array is an object
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with the following keys and values:
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"name" ::= <text>
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The name of an additional form field where the content of the MMS part
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is sent as an attached file.
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"cid" ::= <text>
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The Content ID of the MMS part. This allows the server to resolve
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references in the SMIL part of the MMS
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(e.g. <img region="Image" src="cid:805"/>).
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"type" ::= "application/smil" | "text/plain" | "image/jpeg" | ...
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The Content Type of the MMS part.
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"filename" ::= <text>
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The filename of the MMS part, as sent by the sender phone,
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e.g. "Image001.jpg".
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(Additional fields with the content of each MMS part. Text parts
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are encoded in UTF-8.)
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Additional parameters sent in POST requests with action=outgoing:
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(None)
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Additional parameters sent in POST requests with action=send_status:
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"id" ::= <text>
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The Server's ID for the outgoing message (as sent in a previous
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response XML).
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"status" ::= "queued" | "failed" | "sent"
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The current status of the outgoing message.
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"error" ::= <text>
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A description of the reason for the error, if the message
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failed to send; or, an empty string if the message
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has been sent successfully.
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--------------------
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HTTP Response Format
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--------------------
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For a successul request, the server should return HTTP status code 200.
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If the signature check failed, the server should return status code 403.
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Other status codes may be used to signify errors.
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HTTP response format for action=incoming and action=outgoing:
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The Content-Type header should be text/xml, with the content as follows:
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<messages>
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The root XML element.
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Attributes: none
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Content: <sms>*
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<sms>
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Describes an outgoing SMS to send.
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Attributes:
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"id" ::= <text> (optional)
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An ID for this outgoing message. (KalSMS will send this
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back to the server as the id field in a send_status request.)
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"to" ::= <text> (optional for incoming, required for outgoing)
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The phone number to send the SMS to. If omitted for
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action=incoming, it will be sent as a reply to the original
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sender.
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Content: CDATA
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The content of the SMS message to send.
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Example:
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<?xml version='1.0' encoding='UTF-8'?>
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<messages>
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<sms id='42' to='5551212'>Message One</sms>
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<sms>Message Two</sms>
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</message>
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Response format for action=send_status:
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The response content is currently undefined and ignored.
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=======
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License
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=======
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The code is released under the MIT license; see LICENSE.txt
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