How to set up your online cash register to transfer payments to the tax office under 54-FZ?

Question

Electronic commerce

I do not want to pay for a ready-made online cash register solution. I want my own: buy a device, integrate a Yandex cash register on it and transfer payments to it, the device will be transferred to OFD Kontur, and they are already in the tax office.
I read there are 2 options:
1. Put the device in the office and manually transfer the payment.
2. The device itself will receive the payment and send it to the OFD.
Does anyone have experience with either option 1 or 2? If there is - share.

Answer 1

Studied the issue
Most cash registers have a very low-level protocol, it is not very convenient to work with them. Familiarize yourself with it before buying a cash register.
Simply forwarding the ethernet port from the cash register through the router is not very safe, inexpensive cash desks do not have normal authorization. So most likely you will have to put some kind of small computer next to the checkout (Orange Pi for example), which will be the link between the checkout and your website / server.
Well, respectively, this case can fall off due to a power outage and the Internet - it will work unstably.
Checkout sellers say that ATOL is the most reliable manufacturer.
If you do what you came up with this option
Orange Pi 2G IOT (with a GSM modem and USB for the checkout) = 1300 rubles
umka-01-fa-lite cash register with micro USB r connection Orange Pi = 4000 rubles
UPS/power bank = 1500 rubles
FN 1.1 for 36 months = 9500 rubles
OFD e-ofd.ru for 36 months = 1999 rubles
+ additional delivery within the Russian Federation
Inexpensive cash desks
https://tdkasbi.ru/goods/terminal-fa
tdproxy.ru/product/kkm-umka-01-fa-standart
tdproxy.ru/product/kkm-umka-01-fa-lite
Rental of cash desks for 1500 rubles/ month + buy a FN / a place in a DC for a cash desk for 800 rubles per month + buy a FN and a cash desk
https://umka365.ru/
https://online.kit-invest.ru/
https://e-ofd.ru/
Cash desk rental for 2000 rubles per month on a turnkey basis
https://pay54.ru/
The cheapest office is 1999 rubles for 3 years
https://e-ofd.ru/