Registration ID size

[Tomer Peled]

Hi,

I've searched the documentation and the web for an answer for the question : "What is the size of the registration id?" but with no success.

I've found places which says it should be considered as the size of a cookie which is 4096 bytes, but some other places just use 163 bytes.

Notice that from tests which I've made it indeed use 163 bytes on regular base.

How should I store this key in my db? what size should I limit it?

Thanks,

Tomer

[Francesco]

The regID could grow up to 4k,
  f

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[Tomer Peled]

OK Thanks

בתאריך יום שלישי, 24 ביולי 2012 10:26:35 UTC+3, מאת Francesco Nerieri:

The regID could grow up to 4k,
  f

On Jul 23, 2012 11:59 PM, "Tomer Peled" <tomer...@gmail.com> wrote:

Hi,

I've searched the documentation and the web for an answer for the question : "What is the size of the registration id?" but with no success.

I've found places which says it should be considered as the size of a cookie which is 4096 bytes, but some other places just use 163 bytes.

Notice that from tests which I've made it indeed use 163 bytes on regular base.

How should I store this key in my db? what size should I limit it?

Thanks,

Tomer

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[Yim]

Haven't see registration_id longer than 163 chars. Has anyone here seen registration_id larger than that? Possibly, 256 bytes is a safe value for storage. 

4K simply does not make sense. 

[alpaca]

I just had the same question (how large can a registration_id get so know how much storage to allocate to it).

4k does seem like a lot, but I assume GCM is encoding some type of data (at least I hope so).

[Bastiaan Naber]

Mine currently is 184 chars long. I read there have been once longer than 200.

Op zaterdag 4 augustus 2012 20:51:09 UTC+2 schreef Yim het volgende:

[Claiton Lovato]

Hi Francesco, can you please point me to the documentation on this please?

 

I cant understand how the regid could be up to 4kb as the payload itself is restricted to 4kb?

 

Regards,

Claiton

[Eran Eyal]

The Registration ID is not counted in the size limit of the payload, so its max size has no relation to the 4k payload restriction.

[vinil chandran]

I am using VARCHAR as the filed type for GCM Device ID on MySql database table. Is it a good datatype for GCM Device ID or anything else where? If VARCHARE is the better one what will be the Length/Values   i need to specify?

[Francois Groulx]

255 is perferct with varchar. 4k is for the payload, not the reg id.

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[vinil chandran]

Is payload the size of the message we send through GCM? Then if i have a message with X words and i want to broadcast it to Y devices. Then what will be the payload?
is it X or XY ? and also i would like to know what will be the maximum number of devices we can broadcast a message(ie, maximum value of Y)

[Francois Groulx]

Payload is only X and Y is max 1000 by connexion with Google server. When you make a connexion you send each payload with a single reg id individualy with while for or foreach with max1000. If you have more device/client.  Just redo the operation with the next batch of 1000.

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[Costin Manolache]

Payload is the sum of lengths of key/value pairs in the message, I assume that's X in your question.

1000 is max regids per HTTP message. 

If you use XMPP - multiple registrations IDs are not supported, but you can just stream the individual messages, there is no big benefit of using 

multiple recipients on the XMPP connection.

Costin 

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[Rishabh Gupta]

Hi!

is this really 4K size even today or more or less? Please specify the size of key...

[Francois Groulx]

4k is the limit fir the hole payload, if the regid grow 4k, the message would be 0k. 255 varchar is enough for mysql database to store the reg id.

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