Lately I bought a device with a GPRS module. This module is configured with an APN "internet". My sim cards have their own APNs which are obviously different from "internet" and specific to the operators. I can't change the configurations on the device and I don't know why the APN redirection is not working. Any idea on how to proceed in order to connect the device ?
Thank you.
I resolved the problem by using a sim card with an APN "internet".
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I have a SIM7000A device that sees the Verizon tower. I am using Ting wireless SIM to create an IoT device to send emergency information to a homeowner. The SIM works on T-Mobile and Verizon networks.
You can see the tower:
I have selected the wireless.dish.com APN to connect to.
When I try to connect I get this:
My IMEI number is a registered device with Ting. I've verified that.
Using the AT Command Tester for Simcom Modules I get an error when I try to check the Preferred Operators list. I'm not sure if this has anything to do with it.
It seems like when I try to connect, Verizon is trying to validate my device and halting me. How do I connect "through" Verizon's network to the Ting network?
Well, I figured it out. The SIM7000A is not compatible with the Verizon network. According to the person I spoke with at Ting.com, this device only works on T-mobile. With that network, it is not even worth trying to distribute my product to consumers if it uses this chip. I show AT&T as available from this chip but it won't connect to Ting.com regardless. She said it is only compatible with T-Mobile.
I guess I will have to find a new chip.
I've been tinkering with the HM-10 board for a few weeks now, trying to push data from phone to module and vice-versa. The ultimate goal was to enable the BLE mode and tweak with the characteristics and GATT profiles. I'm pretty new to this domain so can anyone help me out ?
And is there any way we can interface the HM-10 with the hardware rx-tx channel instead of soft-serial ?
Your question is still not very clear, but i think you mean sending AT-commands over BLE-radio.
To make this possible you have to change the MODE using serial connection.
In standard mode the device can only be configured over the serial connection (pins RXD and TXD) using AT commands.
AT+MODE0: It only accepts AT-commands over the serial connection (RXD/TXD)
until a central device connects to the module.
AT+MODE1: Same as MODE0, once a connection is established,
AT-commands can be sent over BLE and manipulate some PIO pins on
the device.
AT+MODE2: Same as MODE0, once a connection is established,
AT-commands can be sent over BLE.
To test it just send a string to hm-10 as "AT\r\n" and it will respond with OK.
Update:
You cannot change the services and characteristics with AT-commands.
There are a lot of other things you can change,like advertising, setup a beacon and change a lot of settings.
For a full list of AT commands and more see the official data sheet:
http://www.jnhuamao.cn/bluetooth41_en.zip
I am working on GSM modem and using ublox SARA g 350 modem for GPRS data communication.
And I am able to set pre defined apn using AT command
But my question is, Is there a way to get apn from service provider?
I should handle setting apn depending on SIM inserted by the user.
Can anyone help me to get details for this ?
Using a 2g/gprs modem (BGS2T), it seems like we are able to connect to an APN and communicate data though it with only a GSM connection. Is it possible we are doing this without a pdp context being active between the the modem (mobile station) and the SGSN (Serving gprs support node)/ actually using GPRS?
If you mean a TCP/IP connection over the circuit switched GSM voice network then the only way you can do normally is by using a data modem over the speech path.
It is possible to do that but it would be an unusual way to do data, especially with the different network options available today.
The modem you mention is a GPRS modem however, so it is much more likely you are actually using a GPRS connection.
I have been reading and rereading the GSM Board site, and trying the sample codes on the Arduino IDE. I couldn't find how to get the default APN and SIM identrifier on the card.
Q: How does one obtain the default APN (Access Point Name) and the SIM identifier information from the SIM card?
APN: You have to provide APN to your board externally depending on your service provider.
How to get Service provider name from SIM card?
Use AT+CSPN command to get Service provider name.
GNOME maintains a XML database of service providers and their APN settings:
https://gitlab.gnome.org/GNOME/mobile-broadband-provider-info
There's also the Android APNs database, which is similar:
https://android.googlesource.com/device/sample/+/master/etc/apns-full-conf.xml
You can put the SIM card in your phone, go to settings and find the default APN.
On iOS: View and edit your APN settings
On Android: https://www.androidcentral.com/what-apn-and-how-do-i-change-it