I've been developing a program for about a year now with the GSM1400 board and was forced to transfer over to the new 1500NB because 3G is no longer supported where I live. I've had issues with the SMS system on the new board that I hope I can resolve.
I loaded the example sketch to send an SMS from the device but the system just hangs when I execute the send. When I try to do it manually the modem hangs for a time and returns an unknown error. I loaded the example sketch to receive an SMS and sent an SMS from my phone to the device. There is no SMS received when I run sms.available() nor is there anything in the receive buffer when I do a manual check with AT commands. I am definitely connected to my cellular provider and all seems normal. In fact I called Verizon and they tech support and they verified my device was on line with their network. The curious thing is that when I swap SIMs between my cell phone and the 1500NB I get all of the SMS messages that were sent to the Arduino board as soon as the phone gets connected to the cell system. I can send an SMS from the phone with the SIM originally installed inn the Arduino.
Has anyone actually gotten their 1500NB to send or receive an SMS? If so, can I ask what is different about your cellular plan or script that I may be missing? Does the 1500NB connect to a cellular network in an identical manner as a cell phone or the GSM1400 does or are there differences I am unaware of?
To anyone who has looked at this post I have an update. I used the firmware versions provided here in this group to update mine to L0.0.00.00.05.08.A.02.04 and I was then able to get my modem to send and receive SMS messages. Unfortunately as many have noted in here the device still fails to reliably obtain new SMS messages from the cellular system. My workaround is to send AT+CFUN=0 and AT+CFUN=1 commands to the modem. When the modem reconnects, it retrieves the new SMS messages. It actually works out for some of my program since I prefer to save power when not being programmed by the user or waiting for acknowledgement of alarms. It's still a bug though and a bug is a bug is a bug. I don't like bugs. I'm still fighting with Ublox over getting this latest issue to be addressed by them. Hopefully Ublox will have another FW upgrade coming to address this issue. Meanwhile Arduino is addressing an issue with their library to receive the SMS messages. Look for an update to the MKRNB library soon. Not sure about Ublox.
I had the same issues. After update the firmware (Firmware upgrade for UBLOX SARA-R410M-02B on the MKR NB 1500 #2 - MKRNB1500 - Arduino Forum )
to L0.0.00.00.05.12,A.02.19 it worked out for me. Try this.
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