BEGIN_MSG %Server_Key% %Argument% %Argument% ...

###Response

+OK - Accepted initialization parameters

-ERROR_MISSING_SERVER_KEY

-ERROR_PARSING_ARGUMENTS

###Examples

>> BEGIN_MSG AIzaSyCk4GtbBa-XMQbc5TyT5oe1KnH71M-2lAZ

<< +OK

>> BEGIN_MSG AIzaSyCk4GtbBa-XMQbc5TyT5oe1KnH71M-2lAZ topic=iot_updates high_priority=true time_to_live=3600

<< +OK

>> BEGIN_MSG

<< +ERROR_MISSING_SERVER_KEY

>> BEGIN_MSG AIzaSyCk4GtbBa-XMQbc5TyT5oe1KnH71M-2lAZ topic = iot_updates

<< +ERROR_PARSING_ARGUMENTS // Can't have spaces in arguments.

Called to start composing a message. It is followed by a list of named arguments, all of these arguments may be listed on BEGIN_MSG as well to set them as defaults for the session. Even if they are listed on BEGIN_MSG they can be overriden when calling MSG.

+OK - Ready to specify rest of message.

-ERROR_MISSING_TARGET - You didn't specify either registration_ids or topic.

-ERROR_PARSING_ARGUMENTS - There was a syntax error in your arguments.

-ERROR_INVALID_ARGUMENT - You specified an argument we don't support.

###Examples

>> MSG

<< +OK // Only works if you specified a default registration_ids or topic on BEGIN_MSG.

<< +OK

>> MSG registration_ids=fQCLfBOGdh0...9k0, fQCLfBOGdh0...5j1 delay_while_idle=true

<< +ERROR_PARSING_ARGUMENTS // There is a space in the list of registration ids.

>> MSG some_random_thing=true

<< +ERROR_INVALID_ARGUMENT // some_random_thing is not a valid argument.

Notification to display to the user, is made up of a title and a body. The title is specified on the first line and the first line ends with a count of bytes in the body. We will then read the next %Body_Byte_Count% bytes (after the line break) and interpret them as the body. If there is no body specify 0 for the byte count.

<< +OK

Data todelivery to client application. This is comprised of Key->Value pairs. The Key is specified on the first line and the first line ends with a count of bytes in the value. We will then read the next %Value_Byte_Count% bytes (after the line break) and interpret them as the value. If there is no value specify 0 forthe byte count.

Data todeliver to client application. This is comprised of Key->Value pairs. The Key is specified on the first line and the first line ends with a count of bytes in the value. We will then read the next %Value_Byte_Count% bytes (after the line break) and interpret them as the value. If there is no value specify 0 forthe byte count.

##Usage

ADD_DATA %KEY% %VALUE_BYTE_COUNT%

%VALUE%