Arduino, sim900 fixes

[alejandroMA]

So i´m using a sim900 modem with Arduino as a serial interface.
While trying to connect to it, i would always get a timeOutException,
turns out that Arduino reboots it-self every time a new serial connection
starts so, when the first AT command get send, Arduino isn’t on yet, so it
never reaches the sim900 modem, modem doesn’t respond, timeOutException.
waiting for 2-3 sec does the trick.

Also i needed a way to set a custom CNMI, since the default one doesn’t work
with the sim900 modem.

added "waittingForModemToStartInSeconds" argument to GsmModem.conect(), added AT_CNMI property to GsmModem.

The waittingForModemToStartInSeconds arg allows to wait after the
serial connection has started, and before sending the AT commands.

The AT_CNMI proprety of the GsmModem class allow to specify the CNMI
parameter of the gsm modem, this helps to set up the incoming sms
notifications.

[babca]

@alejandroMA merged here
https://github.com/babca/python-gsmmodem

please check it out and do a pull request there if you found any bugs.

[alejandroMA]

hey @babca, so sorry to be so late to respond, i just though this repo was really death. o
first thank you so much for merging, how ever i made another simple commit to my fork. it only touches the code i introduced. (sorry for the typo in my commit message).
alejandroMA@0010fbd
So i guest i make a pull request to your fork?
Sorry you already merged that.

also i think i would be great if your fork could be up in pip as another package (python-gsmmodem-new maybe, or gsmmodem-new).

[babca]

Thanks for suggestions, I tried to add it: babca#5
I hope it is done right, if not, let me know.

[babca]

@alejandroMA Are you able to help me fix broken unit tests? babca#6 :-)

[alejandroMA]

unfortunately this week i'm a little busy, and i have one modem available right now and it on production-ish, so i cant tinker with it or change to the python-gmsmodem-new right now.

but i would love to help, if you have something in mind for next week i can help :).
Or i'll do the test new week.

[babca]

I'm putting all my ideas into my Issues tab https://github.com/babca/python-gsmmodem/issues
Main three things I'd like to currently see checked and resolved are:

1. test if it is a working replacement for original v0.9 / if it introduces any new bugs
2. check unit tests. "Are they outdated or there are bug in the code?" Fix unit tests after rapid merging babca/python-gsmmodem#6
3. replace serial.Serial() with serial.serial_for_url() in serial_comms.py for a native remote modem support. Add native support for remote modems connected over the network (connect to IP address) babca/python-gsmmodem#2