Search found 22 matches

by Miq1
Wed May 10, 2017 1:45 am
Forum: CELLv1.0
Topic: UART stutters on startup
Replies: 47
Views: 12314

Re: UART stutters on startup

I am sorry to report that I will drop the Cell modules in favour of some cheap SIM808-based GPRS modules. I bought one, connected it and it worked like a charm from the beginning, with auto baud rate and all. No data losses even at 9600 baud, the 18KB of the AT+COPN list were received completely. IP...
by Miq1
Mon May 08, 2017 12:56 am
Forum: CELLv1.0
Topic: UART stutters on startup
Replies: 47
Views: 12314

Re: UART stutters on startup

Does not change much, I am afraid: at+zipopen=1,0,jsonplaceholder.typicode.com,80 OK +ZIPSTAT: 1, 1 at+zipsend=1 > 47 45 54 20 2f 75 73 65 72 73 20 48 54 54 50 2f 31 2e 31 0d 0a 48 6f 73 74 3a 20 6a 73 6f 6e 70 6c 61 63 65 68 6f 6c 64 65 72 2e 74 79 70 69 63 6f 64 65 2e 63 6f 6d 0d 0a 0d 0a +ZIPSEND...
by Miq1
Thu May 04, 2017 12:43 am
Forum: CELLv1.0
Topic: UART stutters on startup
Replies: 47
Views: 12314

Re: UART stutters on startup

Nothing secret with the URL etc. - it is public. at+zipopen=1,0,jsonplaceholder.typicode.com,80 then at+zipsend=1 finally GET /users HTTP/1.1 Host: jsonplaceholder.typicode.com <CTRL-Z> I am currently having problems to send the GET request with Putty, I keep getting a "400 Bad Request" an...
by Miq1
Wed May 03, 2017 3:07 am
Forum: CELLv1.0
Topic: UART stutters on startup
Replies: 47
Views: 12314

Re: UART stutters on startup

Bad news. The network data is missing parts as well. I used jsonplaceholder.typicode.com/users as constant data source. The data as it is supposed to be is this: [ { "id": 1, "name": "Leanne Graham", "username": "Bret", "email": "Since...
by Miq1
Tue May 02, 2017 11:14 pm
Forum: CELLv1.0
Topic: UART stutters on startup
Replies: 47
Views: 12314

Re: UART stutters on startup

I will try today and report the outcome. I would suggest, though, to check the recent firmware version ZTE is using. I suppose it will be different from the one currently deployed in the Cell and may have some bugs fixed.
by Miq1
Tue May 02, 2017 12:03 am
Forum: CELLv1.0
Topic: UART stutters on startup
Replies: 47
Views: 12314

Re: UART stutters on startup

I have run WinMerge over both outputs; after initally catching up with the data, the UART then is losing large chunks, but in regular intervals will bring out another block of ~20 lines, so the internal assumption of the output being not larger than 20 lines seems to show up here.
by Miq1
Mon May 01, 2017 11:55 pm
Forum: CELLv1.0
Topic: UART stutters on startup
Replies: 47
Views: 12314

Re: UART stutters on startup

I have two separate devices (separate Arduinos, power supplies, Cells, SIM cards etc.) that both behave identically, so yes, it seems to be consistent. Here is the AT+COPN output via UART at 115200: at+copn +COPN: "00101","Test PLMN 1-1" +COPN: "00102","Test PLMN 1...
by Miq1
Sun Apr 30, 2017 1:03 am
Forum: CELLv1.0
Topic: UART stutters on startup
Replies: 47
Views: 12314

Re: UART stutters on startup

Do you have two accounts? Yes, I do. I had the "u063096" account before, but that was "permenantly banned" for some unknown reason. So I opened another, the "Miq1" account, but the former was reconstituted later - it was in fact you who kindly did it, IIRC. My tablet n...
by Miq1
Sat Apr 29, 2017 6:48 am
Forum: CELLv1.0
Topic: UART stutters on startup
Replies: 47
Views: 12314

Re: UART stutters on startup

Okay, I nailed it down, I think. :( I connected the Cell via UART to the PC and ran Putty against it. AT+COPN now results in exactly the same data losses that the Arduino showed. So it definitely is a problem inside the Cell. If connected via USB the buffering seems to work, via UART it does not. I ...
by Miq1
Fri Apr 28, 2017 3:43 am
Forum: CELLv1.0
Topic: UART stutters on startup
Replies: 47
Views: 12314

Re: UART stutters on startup

My hair is getting grayer and grayer while experimenting... :( I did some tests with the auto baudrate feature (AT+ZBITRATE=1), but was not able to get the Cell reacting other than when I set the Arduino baud rate to 115200. Even then it took indeterminable time until the Cell reacted at all. Curren...

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