Android Question Send Messages to Multiple Devices by firebase ?

[aboalwaleed]

I want to use for loop and send Messages

                    Dim Cursor1 As Cursor =     Main.SQL1.ExecQuery("select * from emps where fin = 1")
                    For i = 0 To Cursor1.Rowcount -1
                        Cursor1.Position = i
                        Topic   = Cursor1.Getstring("emp_mobile")
                        Title  = "Title"
                        Body  = "Body" 
                        CallSub( Me,"SendMessage" )
                    Next

It works with me but can you send it once?

 

[djingonthenet]

I've been coding with firebase messaging today, easiest way is to subscribe each device to the same topic.

 

[DonManfred]

You need to be more patient.

Create a global list of tokensyou want to send to.
Get the first (or the first 10 or so) token and build the message and send it.
Remove the tokens used from the global list.
Get the first (or the first 10 or so) token and build the message and send it.
Remove the tokens used from the global list.
[..]

 

[aboalwaleed]

Thank you DonManfred
But would you explain more to me

 

[Erel]

Why are you using CallSub instead of calling the sub directly?

Create a message type that holds all the information needed and pass it to SendMessage sub. You can send them all at once.

 

[aboalwaleed]

Hi Erel
Did you mean that?

                    Dim Cursor1 As Cursor =     Main.SQL1.ExecQuery("select * from emps where fin = 1")
                    Dim m As Map
                    Dim data As Map
                    Dim jg As JSONGenerator
                    For i = 0 To Cursor1.Rowcount -1
                        Cursor1.Position = i
                        Topic   = Cursor1.Getstring("emp_mobile")
                        Title  = "Tile"
                        Body  = "Body  "
                  
                                         
                     
                    m = CreateMap("to": $"/topics/${Topic}"$)
                    data = CreateMap("title": Title, "body": Body,"id":idd)
                    m.Put("data", data)
                     
                        jg.Initialize(m)

                    Next
                    Job.PostString("https://fcm.googleapis.com/fcm/send", jg.ToString)
                    Job.GetRequest.SetContentType("application/json;charset=UTF-8")
                    Job.GetRequest.SetHeader("Authorization", "key=" & "AAAAuUAGCooxxxxxxxxx")

But it gives me the error : JSON Array expected

 

[Erel]

This is not what I meant however it should work.

You need to dim and initialize Job inside the loop.