B4J Question FCM - Create Topic String Length

[Harris]

Does anyone know if there is a restriction on the maximum string length when creating a FCM topic (for the client) to subscribe to?

For example, I need to create a (unique) FCM topic (for my FCM app account) such as "Blaine Lake (RM) Division 1".

For example:
The above topic string will be built from combining 2 strings from 2 tables:
Table 1: "Blaine Lake (RM)"
Table 2: (foreign key into) "Division 1"

I have explored Google FCM documents and cannot find any reference to string length restrictions.

Any Suggestions that may work better (such as string value converted to byte value)?




Thanks

 

[DonManfred]

https://stackoverflow.com/questions/48379826/are-there-any-limitations-for-the-fcm-topics-names

Developers can choose any topic name that matches the regular expression: "[a-zA-Z0-9-_.~%]+"

Based on this your topic above will not work.

I would create a new table with hashes for the combined strings. Maybe combined as MD5. Use the md5 hash for the topic you want to send to.

 

[Harris]

Thanks Don for your research.

I see what you (and the link) means...
I think I can work with these constraints.
I shall experiment to see what works - based on my original concept.

Any quick formula to concat my string into a md5 would be helpful.

Aside: Do you ever sleep? You reply night and day - regardless of timezone!
You and Erel share the same TZ (- universe)...

Thanks

 

[DonManfred]

Any quick formula to concat my string into a md5 would be helpful.

dim concat as string = table1str&table2str
' create a MD5 for concat string

 

[Harris]

dim concat as string = table1str&table2str
' create a MD5 for concat string

Shall try... Thanks

 

[DonManfred]

Do you ever sleep? You reply night and day - regardless of timezone!

Not really. I´m in TZ GMT +1 and i am answering here at 6AM to 8AM (before i go to work). And i am answering here in the Evening (after work) from 5PM till 10PM. 10PM to 6AM i am sleeping.

In the last weeks (over xmas) i was in holiday and had much more time to answer here.
7AM till 11PM
But holiday is over

And my way to work is not really far away. My route to work is about 150 METERS

 

[Harris]

But holiday is over

You must have kids, based on last emjoi (back in school)

My route to work is about 150 METERS

Mine is less that 1 meter... from bed to desk...
Living in a 26 foot 5th wheel RV reduces distances to everything (except the beer store...)!

 

[DonManfred]

You must have kids, based on last emjoi (back in school)

No it was just an emoji that i do not care about need working again..
I have no kids, no wife but three Cats. THEY are saying probably "He is gone to work finally, we now can sleep in patience "

 

[Harris]

Good on ya...

(My sweet) Sharpie, one of my cats - the investigator...
She can swat a dragonfly (or grasshopper) out of the air - from 4 feet overhead!