Multi tool use

Invalid topic value provided - While sending FCM to a topic

I am trying to send an FCM message to a topic. But getting "Invalid topic value provided" error from the server.

Json Payload

{
"message":{
"topic":"/topics/news",
"data":{
"title":"Hellow World",
"message":"This is the Topic Message",
"type1":"100",
"type2":"abc"
}
}
}


Response

{
"error":{
"code":400,
"message":"Request contains an invalid argument.",
"status":"INVALID_ARGUMENT",
"details":[
{
"@type":"type.googleapis.com/google.rpc.BadRequest",
"fieldViolations":[
{
"field":"message.topic",
"description":"Invalid topic value provided."
}
]
},
{
"@type":"type.googleapis.com/google.firebase.fcm.v1.FcmError",
"errorCode":"INVALID_ARGUMENT"
}
]
}
}


I have tried topic value as "news" (without '/topics/') but it throws same error. I can send message to the topic from firebase console without any problem.

Any help appreciated. TIA

Edit1 - Notification payload below works fine but data payload doesn't work. As per documentation, data payloads too are allowed https://firebase.google.com/docs/cloud-messaging/android/topic-messaging
Request

{
"message":{
"topic" : "foo-bar",
"notification" : {
"body" : "This is a Firebase Cloud Messaging Topic Message!",
"title" : "FCM Message",
}
}
}


EDIT2 :
This works. I had a small bug in my code which was adding additional quotes to the topic. Below request works like a charm

{
"message":{
"topic":"news",
"data":{
"title":"Hellow World",
"message":"This is the Topic Message",
"type1":"100",
"type2":"abc"
}
}
}


1 Answer
1

according to doc yor request should be like this:

https://fcm.googleapis.com/fcm/send
Content-Type:application/json
Authorization:key=AIzaSyZ-1u...0GBYzPu7Udno5aA
{
"to": "/topics/foo-bar",
"data": {
"message": "This is a Firebase Cloud Messaging Topic Message!",
}
}


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