Protocol Buffers (protobuf) in IOT Protocols - Interactive Code Practice

Practice - 5 Tasks

1fill in blank

easy

Complete the code to define a Protocol Buffers message named Person.

IOT Protocols

message Person {
  string name = [1];
}

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Astring

Bname

C1

Did

Attempts:

3 left

💡 Hint

Common Mistakes

Using the field name instead of a number for the tag.

Using zero or negative numbers for the tag.

The number 1 is the field tag number, which uniquely identifies the field in the message.

2fill in blank

medium

Complete the code to declare an integer field called id in a protobuf message.

IOT Protocols

message User {
  [1] id = 1;
}

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Aint32

Bbool

Cstring

Dfloat

Attempts:

3 left

💡 Hint

Common Mistakes

Using string type for numeric fields.

Using bool or float for integer fields.

The int32 type is used for 32-bit integer fields in protobuf.

3fill in blank

hard

Fix the error in the protobuf field declaration for a repeated string called tags.

IOT Protocols

message Item {
  [1] string tags = 2;
}

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Arequired

Bsingle

Coptional

Drepeated

Attempts:

3 left

💡 Hint

Common Mistakes

Using optional or required for repeated fields.

Using single which is not a protobuf keyword.

The repeated keyword is used to declare a list of values in protobuf.

4fill in blank

hard

Fill both blanks to define a nested message Address inside Person with a string field city.

IOT Protocols

message Person {
  message [1] {
    [2] city = 1;
  }
}

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AAddress

Bstring

Cint32

DLocation

Attempts:

3 left

💡 Hint

Common Mistakes

Using int32 for city which is text.

Using wrong nested message name.

The nested message is named Address and the field city is a string type.

5fill in blank

hard

Fill all three blanks to create a map field from string keys to int32 values named scores.

IOT Protocols

message Game {
  map<[1], [2]> [3] = 1;
}

Drag options to blanks, or click blank then click option'

Astring

Bint32

Cscores

Dfloat

Attempts:

3 left

💡 Hint

Common Mistakes

Using float instead of int32 for values.

Using wrong field name.

The map field uses string keys and int32 values, named scores.