FMB Device Blocking

Figure 1 Block diagram of Countryblocking functionality

Introduction

In 03.27.16.Rev.00 new feature has been implemented to disable device from operating when it is being used in banned countries.
In figure 1 block diagram of new logic is presented and it is presented on the right.

Functionality description

Device checks conditions to block or unblock device each 10 minutes starting from device startup.

Device Blocking

Device will automatically block itself when conditions will be met. All of the parameters are hardcoded and cannot be changed.

1. Device starts using banned Mobile Country Code (MCC). Allowed MCC list is made using Auto_APN.csv file. MCC removed from that list: 250 and 257.
   
2. Use of banned MCC for full 28 days.
   

Device is not counting days until ban, device saves timestamp when device should be blocked (current timestamp + 28 days). That was done to protect device from unnecessary NVRAM read/write operations.

There is possibility to reset this timestamp, to do so, device should stop detecting banned MCC and spend full 7 days without seeing it. In case, for example, if device have counted 10 days with banned MCC and stopped detecting it and to reset that time it has not been detecting banned MCC for 5 days and then again detected banned MCC, device will continue counting time before device block from 10 days as it is shown in figure 1.
This 7 days “counter” works in same way, it is not counting days it saves timestamp when block timestamp should be reset.

Device Unblocking

In order to unblock device, as it is shown in block diagram, device have to detect only allowed MCCs for full 7 days, have timesync and have SIM inserted. If this counter will be interrupted by founded banned MCC it will be reset.

This 7 days “counter” use same variable as 7days counter in device block part and it saves timestamp when device can be unblocked. In case if during this 7 days period conditions will be lost timestamp to unblock will be reset and user will have to fulfill conditions for full 7 days again.

Operating Device in Blocked State

Blocked Features	Description
Record saving	Device will stop saving periodic and eventual records. Prior to device blocking saved records will not be lost.
Record sending	Device will not send any records to server. Prior saved records will be stored and sent once device is unblocked.
Periodic scenario update	Various features will be stopped: OBD/LVCAN Output/Input controlling/reading Geofencing Trip Ecodriving GSM Jamming GSM Jamming GNSS Jamming Fuel Consumption Immobilizer Overspeeding Private/Business Ignition update Other SpecFW features Sleep
Sleep (Power Update)	Sleep feature will be disabled as well as Charger update, OBD plug out notify and OBD unlocker. Since these tasks runs under Power Update task which is responsible for sleep.
Accelerometer	Accelerometer reading will be stopped and accelerometer should not be initialized
IO element updating	IO element values will not be updated
Accelerometer related scenarios	Movement detection, crash detection etc.
BLE Sensors updating	Updating of BLE sensors will be stopped

FW upgrade downgrade rules

Once device will be flagged as Blocked, even in unblocked state it will not be able to downgrade firmware version below 03.27.16 or upgrade to newer.

Additionally, new manufactured devices with firmware which does support Device Blocking feature, will automatically have flag set to not allow device downgrade below 03.27.16 and upgrade to newer than 03.27.16.

Pass through command

In order to allow client to know the location of the vehicle in special cases, pass through for single command has been implemented. SMS/GPRS command “getgps” will be allowed to be sent every 10 minutes to get location of the device, when it is operating in Blocked state.

Initial restriction timestamp: X	Returns timestamp (UNIX) when restriction was registered.
Initial reset timestamp: X	Returns timestamp (UNIX) when block timestamp will be reset, or timestamp when device will be unblocked.
Timestamp when device will be blocked: X	Returns timestamp (UNIX) when device will be blocked.
Timestamp when device will be unblocked or counter will be restored: X	Returns timestamp (UNIX) when device will be unblocked or timestamp which is used to block device will be reset.
Conditions check timestamp: X	Returns timestamp (UNIX) when conditions were checked.
Time until next check: X	Returns time until next conditions check in seconds.