Composed of devices with limited resources, IoT networks have several vulnerabilities. Their increasing deployment in critical sectors and infrastructures requires appropriate security measures. Although the concept of jamming attacks is old, they remain a significant threat in wireless communications today. Targeting both data transferred over the network and the energy reserves of IoT devices, these attacks can quickly lead to denials of service. Indeed, the latter consists in intentionally interfering with the signal used by the legitimate nodes on the network. This article is a summary of several works carried out on the study of jamming attacks from an attacker's point of view. First, an analysis of the effectiveness of the various existing jamming attack strategies, as a function of certain parameters such as energy and distance was realised. From this work, we created an "intelligent" jamming attack capable of optimizing the effectiveness of its attack and minimize its energy consumption, without the need to have knowledge of the targeted wireless networks.