Webhooks are being sent twice to the server

[ico-mabene]

Describe the Bug
Webhooks are being sent twice to the server. Almost the same as issue #301 except for timing (both requests seen within a second on the server side) and app version (1.52.1)

To Reproduce
Steps to reproduce the behavior:

1. Configure webhook endpoint in SMS Gate app with sms:received
2. Receive an SMS message on the device
3. Observe webhook delivery in server logs
4. There are two identical POST requests within a second of each other

Expected vs Actual Behavior

• Expected: Single webhook POST request sent per SMS event
• Actual: Two identical webhook POST requests sent for each SMS event

Screenshots

2026-01-19 20:11:53 10.0.1.30 POST /sms/ReceiveSms apiToken=samplapikey 443 - 10.0.2.13 me.capcom.smsgateway/1.52.1 - 200 0 0 179 681 31
2026-01-19 20:11:53 10.0.1.30 POST /sms/ReceiveSms apiToken=samplapikey 443 - 10.0.2.13 me.capcom.smsgateway/1.52.1 - 200 0 0 179 681 31

Environment

• App Version: 1.52.1, ReleaseId 1271
• Mode: Local
• Operation: receiving SMS
• Integration: .net core webhook receiver
• Network Type: WiFi

Smartphone

• Device: Samsung Galaxy S10
• OS: Android 12
• SIM Card Count: 1

Additional Context

• Saved webhook json data received:

{
	"DeviceId": "ffffffff80e797f10000019bd20a3c07",
	"Event": "sms:received",
	"Id": "xs-fiN26jLEONA899qe-a",
	"WebhookId": "e9yFh4Wh-Znmj05FmFpKW",
	"Payload": {
		"MessageId": "83be51e4",
		"Message": "Ein mal geht\u0027s noch",
		"PhoneNumber": "\u002B43664xxxxxxxx",
		"simNumber": 1,
		"receivedAt": "2026-01-19T21:11:52+01:00"
	}
}

{
	"DeviceId": "ffffffff80e797f10000019bd20a3c07",
	"Event": "sms:received",
	"Id": "az75fdnE6t9aQY7nRVVXy",
	"WebhookId": "e9yFh4Wh-Znmj05FmFpKW",
	"Payload": {
		"MessageId": "83be51e4",
		"Message": "Ein mal geht\u0027s noch",
		"PhoneNumber": "\u002B43664xxxxxxxx",
		"simNumber": 1,
		"receivedAt": "2026-01-19T21:11:52+01:00"
	}
}

• App logs

[{
        "context": {
            "message": {
                "text": "Ein mal geht's noch",
                "address": "+43664xxxxxxxx",
                "date": "2026-01-19T21:11:52.000+01:00",
                "subscriptionId": 1
            }
        },
        "createdAt": "2026-01-19T21:11:53.416+01:00",
        "id": 326,
        "message": "ReceiverService::process - message received",
        "module": "receiver",
        "priority": "DEBUG"
    }, {
        "context": {
            "queueId": 11,
            "url": "https://smsgateway.example.com/sms/ReceiveSms?apiToken=samplapikey",
            "internetRequired": true
        },
        "createdAt": "2026-01-19T21:11:53.444+01:00",
        "id": 327,
        "message": "Webhook enqueued to persistent queue",
        "module": "webhooks",
        "priority": "DEBUG"
    }, {
        "context": {
            "webhookId": "e9yFh4Wh-Znmj05FmFpKW",
            "event": "SmsReceived",
            "internetRequired": true
        },
        "createdAt": "2026-01-19T21:11:53.447+01:00",
        "id": 328,
        "message": "Queued webhook event for processing",
        "module": "webhooks",
        "priority": "DEBUG"
    }, {
        "context": {
            "event": "SmsReceived",
            "totalWebhooks": 1,
            "queued": 1,
            "skipped": 0
        },
        "createdAt": "2026-01-19T21:11:53.448+01:00",
        "id": 329,
        "message": "Webhook emission summary",
        "module": "webhooks",
        "priority": "DEBUG"
    }, {
        "context": {
            "type": "sms:received",
            "payload": {
                "message": "Ein mal geht's noch",
                "receivedAt": "2026-01-19T21:11:52.000+01:00",
                "messageId": "83be51e4",
                "phoneNumber": "+43664xxxxxxxx",
                "simNumber": 1
            }
        },
        "createdAt": "2026-01-19T21:11:53.450+01:00",
        "id": 330,
        "message": "ReceiverService::process - message processed",
        "module": "receiver",
        "priority": "DEBUG"
    }, {
        "context": {
            "message": {
                "text": "Ein mal geht's noch",
                "address": "+43664xxxxxxxx",
                "date": "2026-01-19T21:11:52.000+01:00",
                "subscriptionId": 1
            }
        },
        "createdAt": "2026-01-19T21:11:53.463+01:00",
        "id": 331,
        "message": "ReceiverService::process - message received",
        "module": "receiver",
        "priority": "DEBUG"
    }, {
        "context": {
            "queueId": 12,
            "url": "https://smsgateway.example.com/sms/ReceiveSms?apiToken=samplapikey",
            "internetRequired": true
        },
        "createdAt": "2026-01-19T21:11:53.477+01:00",
        "id": 332,
        "message": "Webhook enqueued to persistent queue",
        "module": "webhooks",
        "priority": "DEBUG"
    }, {
        "context": {
            "webhookId": "e9yFh4Wh-Znmj05FmFpKW",
            "event": "SmsReceived",
            "internetRequired": true
        },
        "createdAt": "2026-01-19T21:11:53.479+01:00",
        "id": 333,
        "message": "Queued webhook event for processing",
        "module": "webhooks",
        "priority": "DEBUG"
    }, {
        "context": {
            "event": "SmsReceived",
            "totalWebhooks": 1,
            "queued": 1,
            "skipped": 0
        },
        "createdAt": "2026-01-19T21:11:53.481+01:00",
        "id": 334,
        "message": "Webhook emission summary",
        "module": "webhooks",
        "priority": "DEBUG"
    }, {
        "context": {
            "type": "sms:received",
            "payload": {
                "message": "Ein mal geht's noch",
                "receivedAt": "2026-01-19T21:11:52.000+01:00",
                "messageId": "83be51e4",
                "phoneNumber": "+43664xxxxxxxx",
                "simNumber": 1
            }
        },
        "createdAt": "2026-01-19T21:11:53.483+01:00",
        "id": 335,
        "message": "ReceiverService::process - message processed",
        "module": "receiver",
        "priority": "DEBUG"
    }, {
        "context": {
            "attempt": 0
        },
        "createdAt": "2026-01-19T21:11:53.506+01:00",
        "id": 336,
        "message": "Starting webhook queue processing",
        "module": "webhooks",
        "priority": "DEBUG"
    }, {
        "context": {
            "count": 2,
            "webhookIds": [
                "https://smsgateway.example.com/sms/ReceiveSms?apiToken=samplapikey",
                "https://smsgateway.example.com/sms/ReceiveSms?apiToken=samplapikey"
            ]
        },
        "createdAt": "2026-01-19T21:11:53.541+01:00",
        "id": 337,
        "message": "Processing 2 webhooks",
        "module": "webhooks",
        "priority": "DEBUG"
    }, {
        "context": {
            "webhookId": 11,
            "url": "https://smsgateway.example.com/sms/ReceiveSms?apiToken=samplapikey",
            "retryCount": 0
        },
        "createdAt": "2026-01-19T21:11:53.773+01:00",
        "id": 338,
        "message": "Webhook sent successfully",
        "module": "webhooks",
        "priority": "INFO"
    }, {
        "context": {
            "webhookId": 12,
            "url": "https://smsgateway.example.com/sms/ReceiveSms?apiToken=samplapikey",
            "retryCount": 0
        },
        "createdAt": "2026-01-19T21:11:53.830+01:00",
        "id": 339,
        "message": "Webhook sent successfully",
        "module": "webhooks",
        "priority": "INFO"
    }, {
        "context": {
            "totalInBatch": 2,
            "processed": 2,
            "failed": 0
        },
        "createdAt": "2026-01-19T21:11:53.838+01:00",
        "id": 340,
        "message": "Batch processing completed",
        "module": "webhooks",
        "priority": "DEBUG"
    }, {
        "context": {
            "processedCount": 2
        },
        "createdAt": "2026-01-19T21:11:53.840+01:00",
        "id": 341,
        "message": "Queue iteration completed",
        "module": "webhooks",
        "priority": "DEBUG"
    }, {
        "context": {
            "attempt": 0
        },
        "createdAt": "2026-01-19T21:11:53.845+01:00",
        "id": 342,
        "message": "Webhook queue processing completed",
        "module": "webhooks",
        "priority": "INFO"
    }
]

Checklist Before Submission

• I have described the bug in detail.
• I have provided the steps to reproduce.
• I have included screenshots (if applicable).
• I have provided environment details.
• I have included relevant log file excerpts (if applicable).
• I have read FAQ and other relevant information.

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⚠️ Possible Duplicate Issue

• Bug Report: Webhooks are being sent twice to the server with a consistent 5-second interval between duplicates. #301

🔗 Related PRs

#224 - [webhooks] add deviceId field to the API for compatibility with Clo… [merged]
#229 - [webhooks] add sms:received webhook registration notification [merged]
#258 - [receiver] basic MMS support in webhooks [merged]
#297 - [webhooks] webhooks queue [merged]

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[capcom6]

Hello,

Thank you for the report.

According to the log, the event is received twice by the app from the system.

Could you please provide some additional information:

1. When did this issue first occur? Did it start after an app update, or is this your first time using webhooks?
2. Are you using the autostart feature, or do you launch the app manually?
3. If you disable autostart, kill the app, then launch it manually, does the problem still occur?

I suggest that the SMS event receiver might be getting registered twice for an unknown reason, causing each message to be processed two times.

Thank you for your help in resolving this.

[ico-mabene]

• Issue first occurred after initial installation (1.52.1); mobile device was factory reset before installation, it's the only non-autoinstalled app on the device.
• I am using the autostart feature
• after disabling autostart and manually starting the app, the issue does not happen.
• reenabled autostart, rebooted and unlocked the device; app started and still just one call.

So: I'm afraid we'll have to close the issue as I can no longer reproduce unless you have an Idea what I could try.

[capcom6]

Thank you for providing that follow-up information and for conducting those tests. It's very helpful.

I believe I have identified a potential bug where the event listener could be registered multiple times under certain autostart conditions.

I will work on a fix for this in the codebase. If the issue reappears in the future, we can test it with a newer version of the app that includes the fix.

Thank you again for your thorough report and assistance in diagnosing this.