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15 votes
Accepted

Can I send my GSM IoT device via airpost?

The IATA Lithium Battery Guidance Document is as close as you can get to a worldwide set of guidelines for battery transport by plane. The section which I assume applies to your device is 2.3.5.9, ...
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7 votes

SSH into an Orange Pi connected to the internet via 2G GSM module

Most cellular providers use Private IP (RFC-1918) ranges (e.g. 10.0.0.0/8) and NAT for their networks which means it is not possible to directly access a device connected via these networks remotely ...
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  • 12k
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 ...
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6 votes

Syntax for using HTTP GET with ampersand and float

Parameters to an HTTP GET request are key/value pairs, separated by an ampersand & The key and value are separated by an equals sign. Your use of DeviceData=T=<value> breaks this rule. ...
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6 votes

IoT 2G wireless data - service providers options in USA

Have you looked at Particle.io or T-Mobile? T-Mobile offer unlimited connectivity for $25/year per SIM. They also have a web management platform, API and can optionally integrate with Twilio's ...
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  • 161
6 votes

Calculate velocity and direction on microcontroller or on remote server?

As Bence says, it depends on the chip, and accuracy needed. But I'd like to add one thing: many GPSes output speed and heading (direction) in one of their NMEA sentences. If your GPS chip does this,...
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  • 246
5 votes

How to pass two parameters in header using AT Command with SIM800 GSM modem?

As per SIM800 AT command Manual, you can set HTTPParamTag to USERDATA and send content in HTTPParamValue. You can pack all key-value pairs into HTTPParamValue and parse to retrieve individual key-...
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  • 2,560
5 votes

Calculate velocity and direction on microcontroller or on remote server?

It strongly depends on the MCU you have, but I think any microcontroller on the market could handle this task easily. Calculating velocity and direction from the coordinates is not a big deal. I think ...
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5 votes

Can I send my GSM IoT device via airpost?

If the device is powered, and the radio is capable of being powered, then this is likely to be prohibited by the carrier. You should find the specific carrier will provide regulations for what can ...
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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 ...
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  • 121
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 ...
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4 votes

Can I send my GSM IoT device via airpost?

As a GSM capable device you must switch it to Airplane mode. Which means the device RF interface must be completely shut down. Basically what you have described can be any smart phone, and I believe ...
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4 votes

How to transmit binary data over CIP using AT commands?

AT command set for GPRS network is standardized so you can search for help on other pages like this [link1] and this [link2] In addition to that, be advised to check examples from this link too [...
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4 votes

Calculate velocity and direction on microcontroller or on remote server?

As a person that created fleet management system processing data from devices with GPS receivers that currently serving two million units that consists from more then thousand of different types of ...
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  • 766
3 votes
Accepted

Connecting a SIM800L to a IBM BlueMix Server via MQTT

I've found this library useful to solve issues with authentication. If you encountered same issues on GSM modules with Arduino, it may help you as well: https://github.com/elementzonline/SIM800_MQTT
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2 votes
Accepted

2G-4G SIM Cards for Cellular Modules, specifically the new NB-IoT

You probably already know more about this, than even 3GPP does. Looking at their documentation, which is not to be read by the faint-harted, it seem that NB-IoT is using a new special category of the ...
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  • 136
2 votes

MQTT Library for Arduino using GSM

There is a good library called GSM_MQTT.hfor sending data through mqtt from GSM modules. You can refer this site. Hope this helped.
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  • 280
2 votes

How can I increase the size of the receiving sms Buffer in GSM

An SMS message has a maximum size of 160 chars. While modern devices will allow you to send what look like longer messages they are just multiple messages that the devices concatenate together when ...
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  • 12k
2 votes

GSM enabled Linux device with USB link

Orange pi has some boards that might be what you're looking for. Look for their "IoT" models; some have 2g, 3g or 4g modules built in.
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1 vote

Why would MKR GSM stop transmitting data to IOT cloud after a certain amount of time transmitting fine?

One thing that could have helped someone answer was the info on what the situation was when you saw no data. i.e, was the Arduino still functioning (i.e, perhaps you had code that blinked the LED and ...
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1 vote

Bare minimum infrastructure to keep a fleet of IoT devices running and ensure updates to OS and applications?

AWS has their solution to this as Greengrass Others have their own, I'm sure. Lots of examples on that website. "Bare minimum" is tricky! Its like asking: Here's what I need. Is there ...
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1 vote

Problem with UART of Fona 3G from adafruit. (aka SIM5320a)

All right. Thanks to those of you who posted comments. It turned out to be an issue with the baud rate! Its always the simple stuff. Adafruit said this thing has auto baud meaning you can use any baud ...
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1 vote

How to trigger a function in SIM800C Module using an SMS from AWS IOT?

A GSM phone or modem receives messages automatically. Basically you are just retrieving the messages from the memory of the device or SIM card. To select the message storage used to read the messages ...
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1 vote

IoT 2G wireless data - service providers options in USA

We use Sierra Wireless - one reason we picked them is for their detailed Web Service API documentation. Their model is that individual devices connect to them; sensor readings etc are retained in ...
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  • 111
1 vote

Syntax for using HTTP GET with ampersand and float

To get ampersand to work properly, it also needs to be url encoded. Try substituting it with %26 and you can have it in the url. Dot from float should be %2E to work properly. Values can be checked ...
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  • 4,301

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