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[choisadal]

1. STA info.
- Device type: IoT Device using Power Save Mode 
- Beacon check interval: 1.8sec
- using 'PS-Poll' frame method (802.11 standard): When the station receives a Beacon with its AID in the TIM element, the STA initiates the frame delivery by transmitting a PS-Poll control frame to the AP.

2. Root cause
- AP should send the Data frame after checking on STA wake-up from PS Poll frame. But, D Link COVR C1203 AP sends the Data frame before Beacon frame.
- Eventually, the STA does not receive the data sent before the Beacon frame.

3. Detailed description based on capture file between D-Link COVR C1203 and STA.
- Very often COVR C1203 sends Data frame(UC:Ping Request) to STA before sending Beacon frame.
- After sending Data, COVR C1203 notifies to STA having AID that there is buffered Data.
- STA response PS Poll “I’m ready to get the data” when the COVR C1203 indicates it has buffered frame addressed to the STA.
- Although COVR C1203 receives the PS Poll, COVR C1203 did not send the Data frame to STA. Because COVR C1203 already sent Data frame(at first step) before sendind Beacon frame.
- For that reason, COVR C1203 thinks STA is disassociated after trying to send data frame several times.
- So, upon receiving the data frame from STA, COVR C1203 sends Deauth frame to STA due to Reason code: Class 2 frame received from non-authenticated STA.(0x0006)

4. Standard procedure for receiving data from AP by device using Power Save mode.
- When the AP has the data to send to the STA.
- First, a Beacon(with AID) must be sent to notify to the STA that there is buffered data.
- The STA that receives the Beacon(with AID) from AP, transmits the PS-Poll frame to AP.
- The AP that receives the PS-poll frame learns that the STA is ready to receive.
- So, AP transmits the buffered data to the STA immediately.(802.11 standard)

[FurryNutz]

Link>Welcome!

• What Hardware version is your router? Look at sticker under the router case.
• Link>What Firmware version is currently loaded? Found on the routers web page under status.
• What region are you located?

What is the Mfr and model# of the IoT device?

[choisadal]

Sorry I'm late

Thank you for your concern.
Please refer to the answer below.

What Hardware version is your router? Look at sticker under the router case.
-> HW Ver. : A1
Link>What Firmware version is currently loaded? Found on the routers web page under status.
-> initial F/W version 1.04, I tested latest F/W version 1.08
What region are you located?
-> Korea
What is the Mfr and model# of the IoT device?
-> My Device is Digital Door Lock with Wi-Fi solution.
What is the Mfr and model# of the IoT device?
-> Samsung SDS, It is a product under development.
-> For verification, I took the same test with Samsung smartphone Galaxy Note 10.
    The problem that came out of my product occurred in the same way.

[FurryNutz]

I recommend that you phone contact your regional D-Link support office and ask for help and information regarding this.
Link> Tech Support Contact Information
We find that phone contact has better immediate results over using email.
Let us know how it goes please.

[choisadal]

Thank you

I'm in a very difficult situation right now.

D-link covr 1203 is unfortunately not released in Korea.
So I bought it in Amazon mall.
The problem arose here.
In Korea, it is not possible to provide technical support because the product is not officially released in Korea.
So, when I asked the US for technical support, it is possible to provide technical support only for off-line sales products used in the United States.

Now, I do not know where and how to request technical support for the problem of D-link covr 1203.
In addition, it is impossible to understand how global companies respond to customers of D-Link.
Please help me how to get technical support.

Thank you.

[FurryNutz]

Ya, support is a regional thing. Korea has there own support and some regions don't support some model routers as in other regions, i.e. USA. There is no cross regional support.

I recommend that you return the 1203 to Amazon and find something that is fully supporting in your regional D-Link office.