You have a patent, and you believe someone is infringing it. There are a number of ways to address the infringement, such as send a cease and desist letter or file a lawsuit. But posturing for litigation is not always the best option. Just because you have rights does not mean that you should run to court to enforce them or even threaten to enforce them. Instead, a strategy to deal with a potential infringer should be well thought out and include an analysis of a variety of factors.
The first question is, “What harm is being done by the potential infringement?” Once you determine the harm of infringement, you can better gauge how to address the problem. For example, is the product or service at issue paramount to you or your company's business, or does the infringement affect you or your company's reputation on a small line of products or services? Are you dealing with a competitor? Do you have obligations to maintain exclusivity for other licensees? If the harm goes to a core issue for you or your company, then you may need to consider a more aggressive strategy. If the harm is merely peripheral to your business, then you can likely address the problem with a more conservative strategy.