Hi, i wonder if someone can help me. I have followed the guide and have connected GND from TTL to GND of the Gateway. Then i connected TX from Gateway to RX on TTL and connected it to the USB. Then i powered the gateway. When i try to connect with Putty, i use 115200 for baudrate and COM1. Putty then opens a new window witch stays blank. I dont what im doing wrong. Any help would be nice.
Not working for me
I have been fighting with this a couple days now , but i finally got it… 
I had the same issue as you, with no output in Putty…
And the problem was that i wasn’t connected properly to TX on the gateway
So check the cable again…
I managed to get it working, port 9898 opened and discovered in OH.
Hey guys! Thanks for the info above. I’ve already connected to my gateway, but when I enter psm-set network.open_pf 3 it answer me psm_set_variable() failed with: -1.
psm-get network.open_pf answer 2. Ports are closed, try to restart the gateway - nothing, try to check and play with rx\tx wires - nothing. 
I can’t find any information about that. Could you help me?
G’day all,
Apologies for the cross post, but anyone have any idea on my issue whereby I am unable to get OH to effectively listen for Xiaomi heartbeats?
Hi,
I am having the same issue.as Oguz Kekec.
No answer in Putty on the Xiaomi Hub serial port.
Interface wired as : Tx-Rx, Rx-Tx, GND-GND
If I hit return in Putty, Hub remains blinking.
If I don’t hit return in Putty, Hub goes from blinking to fix blue light (standard behavior)
Any clue ?
Are you sure you turn on the gateway without connecting the RX gateway that you need to connect after turning on the gateway?
Thank you for fedd back.
When I apply AC to the gatewy, the serial link is not connected (Rx, Tx, GND not connected).
Just after applying AC to the gateway, I connect the serial link (Tx, Rx, GND) between the PC and the gateway and send “enter” with Putty.
I am using the EU version of the gateway of course.
maybe this is the problem? I opened ports in Chinese the other day, everything went smoothly.
My understanding is that the serial trick was for the EU version as Cadavre explained it on March 28.
Solved! If you faced with that issue “psm_set_variable() failed with: -1”- use psm-delete network.open_pf and then psm-set network.open_pf 3. 
Did you manage to enable services that allow to use Aquara EU Hub (Homekit) within Openhab?
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I am not working with OpenHAB, but with HomeAssistant.
My understanding is do the serial trick to enable the EU services whether you run afterwards OpenHAB or HomeAssistant.
May be I miss something.
Continuing the discussion from [SOLVED] Openhab2 - Xiaomi Mi Gateway - does not respond:
Hi cadavre, i see that you finally figured out to connect the hub to HA.
I soldered and connected to UART and I’ve managed to get factory test mode. But when I exit it, it asks for login info. which I don’t know what they are. I’m stuck at this point. It drives me crazy. Could you please help me. I’m all newbie these stuff. I couldn’t understand how I will be able to reset password. Even don’t know how I will boot into bootloader and enter printenv command. 
btw: My hub is DGNWG05LM. Its from Mi Smart Sensor Set global version
Hello!
I followed up your intructions with same hardware. it worked well.
I tried to open the ssh port with insert dropbear -p 22 with nano
i was root and CTR-X - save and overwrite.
I tried rebbot with device, but it was unreachable with mi home and it seems to be in …like i was connected with uart, but it wasnt
ok, reconnect with uart and check the boot. it booted but it seems.
i wiped out the rc.local file somehow.
can i got a copy of yours, or how can i restore it? 
Thx!
Hi there,
I´m new in every direction. Nevertheless I managed to buy and install lots of shelly and xiaomi gadgets and get them running on their respective apps. Also I got myself a brand new raspberry 4 with 4GB and managed to get openhab running and the network binding installed, as well as the xiaomi mi smart home binding.
I enabled the developer mode on the xiaomi app (IOS), turned on the access and noted the “password”. I tried to connect the gateway like in this video. However, no thing can be found. I tried manually but with no success.
Eventually I found this thread. I have the xiaomi gateway, not aquara. In the app it says “lumi.gateway.v3”. Next step I´ll try to find out whether port 9898 is open. Although I don´t know how, yet. Any easy description? Additionally I´ll try to find out what the following things mean:
- nmap
- putty
- monkeycom
- UART
- tcpdump
- MQTT
If I find a definition for dummies I´ll share. If there´s is a" how to use", tutorial or something already I appreciate a link.
Meanwhile some questions for you:
- If the port 9898 is closed, is soldering and UART the only solution?
- I thought of a zigbee stick as an alternative. This thread suggests that a zigbee stick with the zigbee binding is not working well. Is this a good alternative to point 1, or not?
- What is zigbee2mqtt? This thread says there is a binding but the addon list does not say so. Is this an alternative and how does it work?
- The gateway cannot reach the sensor in the garage. If I read this right, xiaomi range extention is only possible with another xiaomi device with AC power? Correct?
Thanks so far
restore from /etc/rc.local.mi, cmd: vi /etc/rc.local->:r rc.local.mi->Esc->:wq
Managed to empty out my rc.local file and save it by accident, had some putty terminal issue. Does anyone have a copy for the aqara gateway, its the one with all the RX, TX, GDN pins on the side of gateway? @cadavre