GPy with Hologram.io SIM
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Anybody know how to get an evaluation Cat M1 SIM that will work.
On the Verizon web page they state: "Machine to Machine Plans are available only to business customers with five or more CLEU lines that have signed a Major Account Agreement. "
Verizon Machine to Machine Plans
I talked to Kore about a month ago, and they did not offer Cat M1 SIM's at that time.
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We've talked to the Verizon open development team and they indicated that CAT M1 is on ALL Verizon LTE towers in the country.
There's got to be some explanation as to why we cannot connect with the GPy.
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The Verizon Wireless HelpDesk @ 800-525-0481 has now told us our Hologram SIM is not a valid SIM on their network. We have contacted Hologram to try to determine what could be the problem. No word yet from Hologram.
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@tlanier said in GPy with Hologram.io SIM:
The Verizon Wireless HelpDesk @ 800-525-0481 has now told us our Hologram SIM is not a valid SIM on their network
Yep, still trying things here as well. As Ryan said over on our forum, it's possible that Verizon does not have direct records of our SIMs on their network and we encourage everyone to contact us directly for connectivity. We understand you're frustrated while we try to get this sussed out, we are as well. The problem with SIM cards that normally "just work"...is when they don't.
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Speaking of frustrated, I'm still getting errors from lte.connect(), is there a way to get a more verbose output?
I just saw in the docs that there is a firmware update for the modem as well as as the Pycom boards themselves, going to try that now. Is it possible that that could be contributing to the problem?
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I added at('at+csq') into the loop and saw that as the device eventually finds its way onto the network here locally, it goes from "99, 99" to "11, 99" or so. Does yours change if you insert that into the loop, @tlanier? Also could you post a picture of your mobile rig? I'm curious about how you have it all hooked up and powered and such.
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I did do the firmware update from:
I have not done the modem firmware update. Thanks for the link. I will try that first thing in the morning.
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I'm just using the expansion board 2.0 with the GPy powered using the USB port to my computer desktop. I've also drove around in the car with the unit plugged into the USB port on my car.
I'll try the AT+CSQ command in the morning and post the results.
As a new user the system will only allow me to post every 10 mins so I sitting here waiting for the 10 mins to expire so I can send this post...
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Thank you both so much for your continued tests.
@ChrisGammell We're investigating your .connect() problems. I think our command timeouts were very short for some situations and I've let the LTE team know, hope to see an improvement on the next release.
Modem firmware could have an impact but it's hard for us to tell because our modem manufacturer, very much like Verizon, just doesn't understand roaming MVNOs like Hologram. They only think in terms of carrier certification with the carrier's own SIM card.
That said it won't harm anything to try a newer modem firmware as long as you are careful with the upgrade - give it lots of time to complete even when it seems nothing is happening!
We should be releasing a more streamlined modem upgrade process soon so you can also wait for that instead.
If anyone else can help us run some tests with Hologram especially in a known good coverage area where you already see 2,5 and valid CSQ let us know. It would help if perhaps someone can give us remote access (e.g. TeamViewer) to check out a few parameters.
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@chrisgammell
I'm getting a +CSQ: 11,99 here indoors. -
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@tlanier
Which antenna is that? Do you have a link?
Is it suitable for 746-787Mhz (Band 13) operation? -
I've moved the unit to a front office where I'm now getting +CSQ: 15,99 signal strength.
You may have discovered my problem about the antenna.
My hardware guy is not here at this moment, but this is the part number I got off our last order which is what we use for our 4G LTE modems connecting to T-Mobile.
Would the fact that I'm now getting a signal strength of 15 not indicate that the antenna is sufficient?
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After moving the unit to a different office, I'm now getting:
+CEREG: 2,4
+CSQ: 99,99@jmarcelino has indicated that I have the wrong type of antenna.
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@tlanier
RSSI (from CSQ) is only one measurement. Are you still not seeing CEREG returning 2,5 ?Ideally you'd use an antenna supporting 700Mhz bands, of course your antenna works on that frequency but doesn't appear designed for it so you may be losing some signal.
Can you increase the delay on your attach loop to 5s
time.sleep(5)and addat('AT+CEER')at each iteration to see if there's any error reported? -
I'm available to allow you to remote into our system anytime.
I'll order a new antenna today if you want to wait until I have the correct antenna.
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Here's what I'm getting now after increasing the delay to 5 secs in loop with the AT+CEER command. I updated the image to show the correct time counter.
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@tlanier
Thanks. Unfortunately it's not very helpful in this situation but keep the CEER in the code if you do get a valid CSQ again it may show a reject cause.It might be the case that the modem is connecting but being rejected by the network for some reason and then we'll know why...
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Hologram tech support suggested plugging the SIM into an unlocked cell phone for testing.
When we plug the SIM into an unlocked Samsung S5 phone, "TMobile-Hologram" shows up in the Available Network Operators.
When we try to go to a web page (google.com), we get an off line error page.
We were able to send a text message to the Samsung S5 from the Hologram Dashboard.
I'm not sure what this really proves since we're trying to use the SIM to attach to Verizon's CAT-M1 network.
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@tlanier said in GPy with Hologram.io SIM:
When we try to go to a web page (google.com), we get an off line error page.
Umm that should work, you should be able to load Google.com. Do you have data left?
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