The correct answer is: TRUE.
CoAP messages are designed to be small and efficient, so that they can be transmitted over low-bandwidth and unreliable networks. The maximum size of a CoAP message is 8192 bytes, but most messages are much smaller than this. For example, a typical GET request for a resource might be only a few dozen bytes in size.
The small size of CoAP messages is one of the reasons why it is well-suited for use in the Internet of Things (IoT). IoT devices often have limited resources, so it is important to use a protocol that does not require a lot of bandwidth or processing power. CoAP messages are also very efficient in terms of the amount of data that they transmit. This is because CoAP uses a binary encoding scheme, which is more compact than the text-based encoding schemes that are used by some other protocols.
In addition to being small and efficient, CoAP messages are also designed to be reliable. This is important in the IoT, where devices may be located in remote or difficult-to-reach areas. CoAP uses a number of techniques to ensure reliability, including acknowledgments and retransmissions.
Overall, CoAP is a well-designed protocol that is well-suited for use in the IoT. It is small, efficient, and reliable, making it a good choice for devices with limited resources.