How to set up the network for opening a store? The payment receiver disconnected and missed orders, and customers even got fined for WiFi. I helped the small supermarket downstairs sort it out

at the end of last month, a buried water pipe on the road outside the community cut the fiber optic cable once, causing the broadband on the entire street to be down for about forty minutes. During those forty minutes, Old Wang's small supermarket downstairs was like that. He later described it to me: the checkout counter was completely quiet, the WeChat payment speaker didn't make a sound, an elderly lady left with a basket of groceries, and only realized the next day that the order hadn't arrived at all. Over thirty yuan, not much, but Old Wang felt frustrated—the speaker was good, the electricity was working, but the problem was that the speaker was connected to the store's WiFi. The broadband behind the WiFi was cut off, and the speaker became just a decoration. This was already the second time he paid tuition on a network device . That night, I helped him reorganize everything from the beginning and found that the network at home is completely different. The most important principle is: if you don't need it at home, the store is your lifeline: the more critical the equipment, the less you should count on broadband in the store.

I first divided the store's equipment into three levels according to the "What Food Network" system

Lao Wang's store was connected to the store, counting them all—there were more than his own home: one WeChat payment speaker, one Meituan and one Ele.me order printer, three cameras, one cash register, and a WiFi connection for customers. These things look messy, but if you score them by 'what connects to the internet,' they're in three tiers.

the first tier comes with built-in 4G, so you can just insert an IoT card and go online, without going through the store's broadband at all. The second tier is for WiFi users; when broadband is cut off, everyone loses their voice. The third tier is for network cables, which are stable, but wherever the cable goes, the device is there—it can't be moved. After the sections were divided, I noticed Old Wang's problem was obvious: the most critical payment speaker in his shop was placed in the second tier, which was the most unforbidden option.

this list is complete, priorities become clear: the two lines of payment collection and takeout must be managed through the "in-store WiFi" section.

payment speakers are your lifeline—don't tie them to the store's WiFi

payment speakers, WeChat has released a long list of models—F1, F2, N1, M1, and even third-party cloud speakers. By network connection, they are divided into two types: WiFi Bluetooth and 4G. WiFi version is only a few dozen yuan cheaper, and the point is that you don't have to worry about data; The 4G version inserts an IoT card and connects via mobile network to connect itself. Sales associates usually won't emphasize that WiFi disconnection is basically like a brick. The broadcast first pushes the payment notification down from the cloud, and if the network goes down, the customer won't know when the money arrives.

4G version is different. The IoT card route is based on base stations. If the store's broadband is cut off, the router crashes, or the power goes out, as long as the speakers have power, it will continue to play. Some say you have to worry about data on the 4G version. I specifically asked about this: a single message from a payment broadcast can be a few hundred bytes, and a month can reach tens of megabytes at most. Mainstream merchant-version speakers only have data guaranteed by the platform or a dozen yuan a year, which is basically nothing. I used my portable WiFi as a broadband for three months, I'm pretty familiar with the temperament of IoT cards—the payment collection speaker, which is always online with low data usage, is actually the most comfortable way to use IoT cards, and it's not the same as those high-data internet cards that exclaim their data.

the mainstream choice now is actually the dual mode of 4G + WiFi, around 200 yuan: when using WiFi, it saves some data, and when broadband cuts, it automatically switches to 4G, taking up both ends. My plan for Lao Wang was to put away his WiFi version as a backup and add a dual-mode device to put at the checkout counter. At first, he complained it was expensive. I said, 'Your basket of vegetables is over thirty yuan, and if you leak it three times a month, the speaker money will be paid back.' After the old lady's order, he hadn't done any more calculations, but this time he paid it out without a hundred fingers.

Takeout Printer: Save a few dozen yuan on the WiFi version, and the order with a disconnected network will really be

the pitfalls of food delivery printers are the same as payment speakers. Lao Wang's shop has one Meituan and one Ele.me, both WiFi versions bought cheaply when the store first opened. During the forty minutes of broadband disconnection, orders still came in on the platform, but receipts weren't issued in stores, and riders couldn't pick up their food at the door. The next day, when I checked the platform backend, I saw four orders accumulated, all made up by the store manually checking the records. One order was marked 'not spicy,' but I didn't see it when making up the order and got complained about.

printer is standard in the 4G version, not a bonus. Meituan's official 4G cloud printer costs around 200 yuan, and third-party brands like Feigo and Hanping also have 4G versions. The price is mainly in the card and 4G module. When choosing, don't just look at the word "4G"—ask yourself: After the internet and power are cut off, will orders be automatically reissued? Reliable machines cache orders from the outage period, and when the network returns, they return to each one one — this is called offline resumption; After the poor machine recovers, you have to manually refill orders in the backend, and when you're busy, you can't remember at all.

there's another small device that most people don't know: 4G printers basically support switching phone hotspots. When you really can't rely on broadband or base stations (like a power outage, 4G towers are fine but your printer dies), the fiber modem router with a power bank is the lifeline of the entire store. That's a story for later, but we'll cover it in the outage contingency section.

the surveillance footage: Old Wang has already paid tuition once

surveillance was the earliest installed and the most pitiful in Old Wang's shop. Two years ago, when he installed his first set, he was tempted by a cheap price. The kit included a non-standard PoE switch. He wanted to use his laptop to enter the camera backend to change the password, but when he plugged in the network cable, the laptop's port burned out. I this in detail in my previous PoE article. Later, that set was retired and replaced with a proper solution: a PTZ at the entrance, a gun camera at the cash register facing the cash box, a gun camera in the shelf passage to prevent unauthorized handling. Two of them connected to WiFi for convenience, and one connected to the network.

the store's surveillance is the biggest difference compared to home: the head at the door triggers more than ten times more frequently, and each person entering or leaving triggers it once. Recording three consecutive videos all day requires over 200GB in one day, which is unsustainable; According the algorithm from my home storage account, switching to motion detection would cost about 40GB a day, so a 128GB card could cover it for more than three days. So relying solely on the on-device card isn't enough for the store's surveillance; it needs to keep recording even when the internet is off: the camera's local SIM card is one layer, cloud subscription is another. For a small supermarket of this size, I advise Lao Wang to have both—the local card ensures the few hours when the internet is off, and the cloud ensures the phone can be checked anytime when the store is empty.

As for whether to implement PoE, how to choose switches, or how to plan the network before installing surveillance , when I reviewed it with Old Wang, he waved it off and said, 'Stop talking, just tell me if these three are enough now.' It was enough, but I casually helped him with a security check, going through the default password and firmware version one by one—the last problem was in that camera self-inspection post. the store's head should be checked even more than the one at home, because it always faces the cash box.

Customer WiFi: The well-intentioned internet might be the most troublesome in the entire store

the customer at Old Wang's shop had WiFi set up two years ago, hung on the main router, with the password being the store's phone number—all regular customers knew it. When I told him about this cable, he was peeling oranges, but after listening, the orange stopped halfway: Strictly speaking, this WiFi is non-compliant.

Since

2023, local police have been promoting a new policy: WiFi provided in public venues must implement real-name authentication. What is real-name authentication? After connecting, a page pops up where you enter your phone number and receive a verification code. Only after verification can you go online. At the same time, your internet history must be retained, with the required retention period of no less than sixty days. WiFi that anyone can connect to just with a password is considered "failure to fulfill security protection obligations." This is not a threat. Zhenjiang issued 14 fines in a single month, and the common trait among the merchants being investigated was that passwords could only connect, without real-name verification; A snack shop in Yangzhou has also received a fine. What's even more troublesome is later: if someone really connects to your website for fraud or money laundering, when the police investigate, they won't know who is using your site and have no records. As the network provider, the shop owner will be held responsible. Old Wang's WiFi has been on for two years, and the password and phone number are known throughout the store, basically running around naked for two years.

compliant approach is to have a VPN with authentication or a carrier's store WiFi solution, with SMS verification and log retention all in place. But at Lao Wang's physical fitness shop, hardly anyone actually connects to WiFi each day—now that data is cheap, fewer and fewer customers come in asking about WiFi. So my advice to him was especially practical: either spend some money to comply with the rules, or simply turn off the customer's WiFi and sign at the counter saying "Our store's WiFi has been disabled, if you don't have enough data, ask the main hotspot." He chose the latter. When guests come to your home, you can use visitor network to entertain them. The store's line is actually cleaner without it—saving a password from flying everywhere and a headache.

the priority of the four lines and what to do on the day of the internet outage

After

sorting, the network in Lao Wang's shop changed to this structure: the payment speakers and two printers were all replaced with 4G/dual-mode, connected to the internet themselves, and continued working even when the broadband was cut off; Three cameras, local card plus cloud dual insurance; The cash register is connected via network cable, and the scanner is mounted on the cash register, collecting the customer's payment for scanning the store code with their phone, not relying on the store's bandwidth; Customer WiFi is turned off. The main router does one thing: bring cameras and cash registers. This structure is the opposite of idea I used to install network for rental apartments—the rental is about separating tenants from each other, while the store is about decoupling key equipment from the store's broadband.

the day the internet goes down, the order will be clear. First, distinguish whether it's your own issue or the district's problem: like this time, when the fiber optic cable was cut off, the whole street was cut off at once, so no hassle was needed. first ask neighbors before calling the emergency call to the report, clearly stating "the whole street is cut," so district-level work orders are resolved faster. Check your own network, check the router's optical modem one by one, follow the order of disconnecting the home network go through it once. Because the key equipment is 4G, you don't need to rescue it the whole time.

one more thing I handed to Old Wang: a small UPS. The optical modem router in the store is 14 to 15 watts. I used a 600VA UPS at home with the same three-piece set it lasted over four hours. Power outages in the store are more frequent than at home. The last lifeline from the cash register and surveillance cameras costs over a hundred yuan, which is more affordable than any membership. After reviewing this, Old Wang summed it up perfectly: losing internet at home is annoying, but losing internet at the store is a loss. Where the money is, the internet will go that way—everyone who runs a shop should remember this.