Mobiveil Technologies India Interview Questions and Answers

Q1. How to mass provision devices using AWS IoT
Ans. 
Mass provision devices using AWS IoT involves creating a fleet provisioning template and using AWS IoT Device Management service.
• Create a fleet provisioning template in AWS IoT console

• Use the template to provision multiple devices at once

• Utilize AWS IoT Device Management service for managing and monitoring provisioned devices
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Q2. How to provision devices using Azure IoT
Ans. 
Azure IoT provides various methods for provisioning devices including manual, automatic, and zero-touch provisioning.
• Use Azure IoT Hub Device Provisioning Service for automatic provisioning

• Leverage Azure IoT Hub Device Twins for manual provisioning

• Implement zero-touch provisioning using Azure IoT Edge
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Q3. What all protocols have you worked on in IoT
Ans. 
I have worked on protocols such as MQTT, CoAP, HTTP, and LoRaWAN in IoT projects.
• MQTT (Message Queuing Telemetry Transport)

• CoAP (Constrained Application Protocol)

• HTTP (Hypertext Transfer Protocol)

• LoRaWAN (Long Range Wide Area Network)
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Q4. How I2C protocol works
Ans. 
I2C is a serial communication protocol used to connect multiple devices in a master-slave configuration.
• I2C uses two wires - SDA (data line) and SCL (clock line) for communication

• Devices are connected in a bus topology with a master device controlling the communication

• Each device on the bus has a unique address for identification

• Communication is initiated by the master device which sends start and stop signals

• Data is t...read more
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Q5. If 2 masters on I2C send data at once which one will take preference ?
Ans. 
The master with the lower address will take preference in sending data on I2C.
• The master with the lower address on the I2C bus will take preference in sending data.

• I2C arbitration is based on the address of the master, with lower addresses having higher priority.

• If two masters attempt to send data simultaneously, the one with the lower address will win the arbitration and proceed to send its data.
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Q1. What is the difference between structure and union
Ans. 
Structure is a data type that allows storing different data types in a single variable, while union is a data type that allows storing only one value at a time.
• Structure allows storing multiple data types in a single variable, while union allows storing only one value at a time

• In structure, each member has its own memory location, while in union all members share the same memory location

• Example: struct Person { char na...read more
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Q2. What is the volatile keyword and it's purpose
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The volatile keyword is used in C/C++ to indicate that a variable may be changed unexpectedly by external factors.
• Used to prevent compiler optimizations that assume the variable's value will not change.

• Commonly used for variables shared between threads or accessed by interrupt service routines.

• Example: volatile int sensorValue; // variable updated by hardware interrupts
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Linked list , data structures

Q1. Explain about yourself
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Q2. Asked past experience
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Q1. Bitwise operation and memory layout in c
Ans. 
Bitwise operations are used to manipulate individual bits in memory. Memory layout in C refers to how data is stored in memory.
• Bitwise operations include AND, OR, XOR, and NOT.

• They are often used for tasks like setting or clearing specific bits, checking if a bit is set, or toggling bits.

• Memory layout in C determines how variables are stored in memory, including their size, alignment, and order.

• It is important to under...read more
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Q2. Explain few terms in LTE
Ans. 
LTE stands for Long-Term Evolution, a standard for wireless communication in mobile networks.
• LTE is a 4G wireless communication technology

• It provides high-speed data transmission and low latency

• LTE uses OFDMA for downlink and SC-FDMA for uplink

• LTE supports multiple antennas for improved signal quality (MIMO)

• LTE Advanced (LTE-A) is an enhanced version with higher data rates and capacity
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Q3. In one path goes wrong in mimo does snr and data both or any one goes bad
Ans. 
In MIMO systems, a failure in one path can affect both SNR and data transmission quality.
• MIMO (Multiple Input Multiple Output) uses multiple antennas to improve communication.

• If one path fails, the overall SNR can decrease, leading to poorer signal quality.

• Data integrity may also be compromised if the remaining paths cannot handle the load.

• For example, in a 4x4 MIMO system, losing one path may reduce capacity and incre...read more
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Q1. Basic steps for debugging
Ans. 
Debugging involves identifying and resolving issues in software or hardware systems.
• Identify the problem by reproducing the issue

• Isolate the cause by narrowing down the possible sources

• Gather relevant data and analyze it

• Develop and execute a plan to fix the issue

• Verify the fix by testing and retesting

• Document the debugging process and the solution
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Q2. What is difference between calloc and melloc
Ans. 
calloc and malloc are memory allocation functions in C. calloc initializes the allocated memory to zero, while malloc does not.
• calloc is used to allocate and initialize memory for an array of elements, while malloc is used to allocate memory for a single element.

• calloc takes two arguments - the number of elements and the size of each element, while malloc takes only the size of the element.

• calloc returns a pointer to t...read more
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