Skip to main content
17 votes

Intercepting web traffic going over cellular network

I have been professionally developing a "device that use LTE/3G or other cellular networks" for decades now, and WireShark is one of our major test tools. Data can be encrypted (generally at layer 2, ...
Mawg's user avatar
  • 3,110
10 votes

Intercepting web traffic going over cellular network

3g v Wifi Security Standard wifi v LoRaWan/LPWAN If I'm worried about a device that could send some personal information without my consent is unplugging it and returning it to the store the only ...
SeanJ's user avatar
  • 1,245
9 votes
Accepted

Why don't we have more 3G+ modem options available?

I expect the situation will change as the demand for NB-IoT picks up, but there are several factors conspiring against your ideal. Only modules are viable unless you have access to ~$1e6 in test ...
Sean Houlihane's user avatar
9 votes
Accepted

Data connection issues during when working with IoT devices

To begin with, if there are 'data issues', those issues should be taken up with the data service provider for violation of an agreed SLA. Next, there should be a offline data store option in your ...
cogitoergosum's user avatar
7 votes
Accepted

Embedded modem options

There is SIMCom with a wide range of modules. (There are plenty of questions about their products on Electrical Engineering Stack Exchange.) They have world wide distributor network. (You can also ...
Bence Kaulics's user avatar
7 votes

UK m590e, Use GSM,GSM compact or UTRAN? (AT+COPS)

You can check the possible options, if you have a working setup, by the following command : AT+COPS=? It will give you the available carriers and the available options usable with them. Answer ...
mico's user avatar
  • 4,331
7 votes

Why don't we have more 3G+ modem options available?

There are many Android Modules based on LTE SOC like Qualcomm MSM8909 and Mediatek MT6735 MT6755 etc. NewMobi has a range of modules.
Jin.Liu's user avatar
  • 89
6 votes

How does APN affect cellular connectivity?

This confusing behaviour is typical. The underlying reason is that it is up to the carrier to decide what to do with the APN setting — unlike most configurations of this form, you're not actually ...
Heath Raftery's user avatar
6 votes

What to choose: 2G, 3G, 4G, LTE Cat-M

LoRaWAN You might consider LoRaWAN. In Belgium & The Netherlands LoRaWAN coverage is pretty good in populated areas; both free and for a fee. Traditional cellular providers in a number of Western ...
Serge Stroobandt's user avatar
5 votes

How do I check whether a LTE network supports CAT M1?

I tried hard to find out an AT command for that, but unfortunately I didn't find it. Instead I found semi new slides about m1 and m2. https://www.slideshare.net/mobile/SmallCellForum1/discussion-...
mico's user avatar
  • 4,331
5 votes

Will using a GCF/PTCRB certified module in my design risk the device getting blocked by Network Operators?

If I understand the question correctly, you're proposing to ignore the legal requirements to avoid interfering with other radio users? Generally this is not enforced by the telecoms operator, it's ...
Sean Houlihane's user avatar
5 votes

What to choose: 2G, 3G, 4G, LTE Cat-M

Sigfox Sigfox pretends to become a global LPWAN operator using proprietary uplink-only narrow-band LPWAN technology over a subscription-based proprietary network. All data will have to pass Sigfox ...
Serge Stroobandt's user avatar
4 votes
Accepted

How can I transmit this information from my device using the least data possible?

What you want is to “pack” your 3 integers as such rather than express the in decimal as text. If your 3 values were for instance 123, 1200 and 45678, then if you send them as three 16-bit integers ...
jcaron's user avatar
  • 2,303
4 votes
Accepted

remotely update a raspberry pi with limited data

Given the answers in the comments then using git over ssh is probably the best option. Firstly git will only pull the differences between the current head hash and the head on the remote. Given you ...
hardillb's user avatar
  • 12.6k
4 votes
Accepted

Receiving "ERROR" message from SIM800C module

The problem was bad contacting between SIM card contact block and the board. The problem was difficult to find because when I touched the terminal for measurement it makes pressure to the board, the ...
luigiesn's user avatar
  • 131
4 votes

Receiving "ERROR" message from SIM800C module

You can enable extended error reporting, by sending AT+CERR. Different devices will give different informaiton, but you should at least get some diagnostic help/hint. For instance, this page says ...
Mawg's user avatar
  • 3,110
3 votes
Accepted

3G SIM5320 support for MQTT

I used the SIM5320 in a product and none of the modules I bought have the MQTT functionality so you must implement the MQTT protocol in a external processor or MCU. Maybe you have to request a ...
Totoxa's user avatar
  • 46
3 votes

Embedded modem options

As requested in comments, I am posting this as an answer. I recommend an Orange Pi 2G IoT. They also have a 4G model. Here's the 2G version, which is considerably cheaper & ought to be enough: ...
Mawg's user avatar
  • 3,110
3 votes

Accessing legacy device with RS232 over 4G Internet

There are commercially available RS232 serial over TCP/IP devices. These tend to run in one of two modes. Single device mode. This uses a custom driver on the computer that creates a local virtual ...
hardillb's user avatar
  • 12.6k
3 votes

Accessing legacy device with RS232 over 4G Internet

I'm not sure there is a 'standard' solution for this, even if it is trivial - because the number of such use cases is surely fairly limited. Since the rs232 protocol must be somewhat open, you can ...
Sean Houlihane's user avatar
2 votes
Accepted

Accessing legacy device with RS232 over 4G Internet

I've worked with RTU's (remote terminal units), this is a common requirement. Maybe a simple modem RS232/4G is enough GTM201, I've used those in the past. Depending on your specific needs you'll ...
Nelson's user avatar
  • 36
1 vote

Best practice way to deal with SIM cards and APNs

I'm not aware of any feature in the network to get the APN. Gnome use and provide mobile-broadband-provider-info to choose "default" APN according number of network parameters (mcc/mnc). ...
Tits's user avatar
  • 171
1 vote

How can I transmit this information from my device using the least data possible?

Slightly too large for a comment, and does not answer your question as posted, but ... Firstly, an upvote to @jcaron and, yes, it is a good idea to lean about data formats (integer/string/etc) and ...
Mawg's user avatar
  • 3,110
1 vote

Search for a device that uses a mobile sim and that acts on a relay by ringing the sim

There seems to be several contradictions in what you are asking for here. If it's turned on/off by ringing it, why does it need to be internet connected at all? If it's internet connected why does ...
hardillb's user avatar
  • 12.6k

Only top scored, non community-wiki answers of a minimum length are eligible