ublox.conf: Fix "PS attached" when roaming

[dzaghal]

Hello,

Got a problem when using IoT SIM card: those cards are not from a specific network provider. As a result they are ALWAYS roaming.

Existing code only considers "PS attached" when SIM card is in home network (code 1), not roaming (code 5). I've added code 5 to say "atttached" when roaming.

If not, command sudo cell_mgmt start fails and cannot get connection.

I only modify this file because my UC-2100 uses this particular modem. This Moxa model is discontinued, I hope the UC-3100 I should receive soon is using this same modem. Maybe you should see if for other modems the "roaming" option is considered.

CODES

From ublox documentation: https://content.u-blox.com/sites/default/files/SARA-R4_ATCommands_UBX-17003787.pdf
Page 187, chapter 13.14.4:

<stat> Number EPS registration status:
• 0: not registered
• 1: registered, home network
• 2: not registered, but the MT is currently trying to attach or searching an operator
to register to
• 3: registration denied
• 4: unknown (e.g. out of E-UTRAN coverage)
• 5: registered, roaming
• 8: attached for emergency bearer services only (see 3GPP TS 24.008 [82] and 3GPP
TS 24.301 [117] that specify the condition when the MS is considered as attached
for emergency bearer services)