SMSTTPS

DNS Service

1. Acts as a central source for domain registration
2. Translates domains into phone numbers
3. Checks is a host is alive

REG Request

Registers a domain against a number with the DNS service.

The senders number is stored as the host for the given domain.

REG <domain>

REG fluffyalpacas

Responses

Success

OK

Already Registered

CONFLICT

GET Request

Requests the host phone number for a given domain

GET <DOMAIN>

GET fluffyalpacas

Responses

Success

OK <HOSTPHONENUMBER>

OK 07879999999

Domain not found

NOTFOUND

Host

1. Responds to GET requets for content

GET request

Requests a resource from a Host.

The sender is assumed to be the device requesting the resource, so the host will respond using the number of the sender.

GET <RESOURCENAME> <SESSIONID> <CONTENTTYPE>

GET alpacas        A7          0

Responses

Success

OK <PACKETHEADER> <CONTENT>

OK A7010901       Alpacas are very fluffy and lovable

Content Not Found

NOTFOUND

Protocol Defintions

Packet Header

1. Session ID - 8 bits
2. Frame Number - 8 bits
3. Total Frames - 8 bits
4. Content Flags - 8 bits

Session ID

• Randomly generated number between 0 and 255.
• Uniquely identifies a request to prevent stray messages causing issues
• Sent with the GET request, and included in each response frame.

Frame Number

• Used to determine the order that that packets should be reconsteructed in
• Starts at 0 and increments by one for each frame to a maximum of 255
• Sent in each response frame

Total Frames

• Used to tell the client how many frames to expect for a complete response
• Valid range 1 - 255
• Sent with each response frame

Content Flags

• 8 bits sent with each content frame
• Each bit is a binary flag describing the content

Bits

1. Content Type - 0 = plain text, 1 = markup
2. unused
3. unused
4. unused
5. unused
6. unused
7. unused
8. unused