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Tracing how a https api server communicates with smart devices

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I've been trying to work out for days how the TP-Link API communicates with the HS100 or any other TP-Link smart device. There is no official documentation, and it's been driving me mad. I use Insomnia REST client to post JSON requests to the API server (https://wap.tplinkcloud.com), and can see simple back and forth requests. However, when trying to control a smart device, I have no idea how the response it transmitted on my network to the device. I've tried Wireshark analysis, but due it being a https server, all data is encrypted. I have used Fiddler and Live HTTP Headers for Chrome to monitor packets leaving my client machine, but I am interested in response and how it reaches the device. My initial guess that the response is sent to the router and then broadcast across the network, but I don't understand how the API server would know the address of the router, considering that the POST request can be sent from any network. My second guess is that the device itself polls to the server, but I can see no evidence of any traffic to or from the device in Wireshark. The only interesting thing is that the device periodically sends out ARP requests for the default gateway, yet this can't be the polling because the intervals are so long, yet the update to the device state is almost instantanious. I'll add a screenshot of Wireshark logs at the point of the request. 07 IPV4 Addresses are the machine making the request, and 54 addresses are the API server. I understand that this is a long question, but I feel like I have exhausted my options based on my ameteur knowledge. Any advice or solutions would be greatly appreciated, thanks. Wireshark results

networking wireshark https sniffing api

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AuspexisAuspexis

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0

I've been trying to work out for days how the TP-Link API communicates with the HS100 or any other TP-Link smart device. There is no official documentation, and it's been driving me mad. I use Insomnia REST client to post JSON requests to the API server (https://wap.tplinkcloud.com), and can see simple back and forth requests. However, when trying to control a smart device, I have no idea how the response it transmitted on my network to the device. I've tried Wireshark analysis, but due it being a https server, all data is encrypted. I have used Fiddler and Live HTTP Headers for Chrome to monitor packets leaving my client machine, but I am interested in response and how it reaches the device. My initial guess that the response is sent to the router and then broadcast across the network, but I don't understand how the API server would know the address of the router, considering that the POST request can be sent from any network. My second guess is that the device itself polls to the server, but I can see no evidence of any traffic to or from the device in Wireshark. The only interesting thing is that the device periodically sends out ARP requests for the default gateway, yet this can't be the polling because the intervals are so long, yet the update to the device state is almost instantanious. I'll add a screenshot of Wireshark logs at the point of the request. 07 IPV4 Addresses are the machine making the request, and 54 addresses are the API server. I understand that this is a long question, but I feel like I have exhausted my options based on my ameteur knowledge. Any advice or solutions would be greatly appreciated, thanks. Wireshark results

networking wireshark https sniffing api

share

asked 8 mins ago

AuspexisAuspexis

12

New contributor

Auspexis is a new contributor to this site. Take care in asking for clarification, commenting, and answering.
Check out our Code of Conduct.

add a comment | 

I've been trying to work out for days how the TP-Link API communicates with the HS100 or any other TP-Link smart device. There is no official documentation, and it's been driving me mad. I use Insomnia REST client to post JSON requests to the API server (https://wap.tplinkcloud.com), and can see simple back and forth requests. However, when trying to control a smart device, I have no idea how the response it transmitted on my network to the device. I've tried Wireshark analysis, but due it being a https server, all data is encrypted. I have used Fiddler and Live HTTP Headers for Chrome to monitor packets leaving my client machine, but I am interested in response and how it reaches the device. My initial guess that the response is sent to the router and then broadcast across the network, but I don't understand how the API server would know the address of the router, considering that the POST request can be sent from any network. My second guess is that the device itself polls to the server, but I can see no evidence of any traffic to or from the device in Wireshark. The only interesting thing is that the device periodically sends out ARP requests for the default gateway, yet this can't be the polling because the intervals are so long, yet the update to the device state is almost instantanious. I'll add a screenshot of Wireshark logs at the point of the request. 07 IPV4 Addresses are the machine making the request, and 54 addresses are the API server. I understand that this is a long question, but I feel like I have exhausted my options based on my ameteur knowledge. Any advice or solutions would be greatly appreciated, thanks. Wireshark results

networking wireshark https sniffing api

share

asked 8 mins ago

AuspexisAuspexis

12

New contributor

Auspexis is a new contributor to this site. Take care in asking for clarification, commenting, and answering.
Check out our Code of Conduct.

share

asked 8 mins ago

AuspexisAuspexis

12

New contributor

Auspexis is a new contributor to this site. Take care in asking for clarification, commenting, and answering.
Check out our Code of Conduct.

share

asked 8 mins ago

AuspexisAuspexis

12

New contributor

Auspexis is a new contributor to this site. Take care in asking for clarification, commenting, and answering.
Check out our Code of Conduct.

asked 8 mins ago

AuspexisAuspexis

12

New contributor

Auspexis is a new contributor to this site. Take care in asking for clarification, commenting, and answering.
Check out our Code of Conduct.

asked 8 mins ago

AuspexisAuspexis

12