Cellular: Add AT+CCID and AT+CGSN

[AriParkkila]

Description

Added new methods in cellular API:

• CellularInformation::get_serial_number to read SN and IMEI of modem with AT+CGSN
• CellularSIM::get_iccid to read ICCID of SIM card with AT+CCID

Fixes Arm internal ref IOTCELL-1091.

Doxygen and return types of the CellularInformation class were fixed at the same.

Usage example:

CellularInformation *info = _cellularDevice->open_information(_serial);
char buf[100];
if (info->get_serial_number(buf, sizeof(buf), CellularInformation::SN) == 0) {
    tr_info("SN: %s", buf);
}
_cellularDevice->close_information();

Pull request type

[ ] Fix
[ ] Refactor
[ ] New target
[X] Feature
[ ] Breaking change

[AriParkkila]

@mirelachirica @jarvte please review

[0xc0170]

as it was - it was good ( see astyle in the travis ). It shows more style issues

Style changes, own commit please

[AriParkkila]

This follows Mbed OS coding guidelines, see astyle in https://os.mbed.com/teams/SDK-Development/wiki/mbed-sdk-coding-style

[0xc0170]

That is the old one. Please do not use it. Anyway, from there "Braces - K&R (see the exception 1 TBS below)" . this { should be attached.

Use https://os.mbed.com/docs/latest/reference/style.html (points to astylerc file that is in our codebase) . Travis runs this and can show you how this breaks the style defined there.

Taken from Travis:

-namespace mbed
-{
+namespace mbed {
 
 /**
  *  Class CellularInformation
  *
  *  An abstract interface that provides information about cellular device.
  */
-class CellularInformation
-{
+class CellularInformation {

[0xc0170]

how does this relates to the new API addition?

[AriParkkila]

That's for size_t definition.

[mirelachirica]

Internal ticket IOTCELL-1097 to unify comments about return values on APIs returning nsapi_error_t.
Suggest: "NSAPI_ERROR_OK on success, or following error codes: -list of possible error codes-"

[AriParkkila]

This is working with UBLOX_C027, but I noticed that other cellular targets need more work.

[AriParkkila]

@mirelachirica @jarvte please re-review target specific adaptation

[AriParkkila]

@0xc0170 this should be now good for merge, I think.

[0xc0170]

/morph build

[mbed-ci]

Build : SUCCESS

Build number : 2368
Build artifacts/logs : http://mbed-os.s3-website-eu-west-1.amazonaws.com/?prefix=builds/7217/

Triggering tests

/morph test
/morph uvisor-test
/morph export-build
/morph mbed2-build

[mbed-ci]

Exporter Build : SUCCESS

Build number : 2001
Build artifacts/logs : http://mbed-os.s3-website-eu-west-1.amazonaws.com/?prefix=builds/exporter/7217/

[mbed-ci]

Test : SUCCESS

Build number : 2157
Test logs :http://mbed-os-logs.s3-website-us-west-1.amazonaws.com/?prefix=logs/7217/2157

[cmonr]

/morph uvisor-test

[0xc0170]

@AnttiKauppila @jarvte Can you rereview please?