## 1 Introduction  
Fresh peaches and nectarines are fruits that are appreciated worldwide by consumers for their juicy texture, high nutrient content, and pleasant flavor [1; 2]. As a kind of climacteric fruits, peaches and nectarines have relatively short lives when compared with other fruits, such as apples, due to fast softening, physiological disorders, and overall deterioration of quality, which significantly decrease their marketing period [3; 4; 5; 6]. The fruit cold chain aims to reduce the quality loss and safety hazards of fruit by the use of artificial refrigeration technology. In that way, peaches and nectarines are stored in a low temperature environment at all times when they are in various stages, such as processing, storage, transportation, sale, etc. [7; 8; 9]. With limited land resources and an ever-growing population, the food supply chain is faced with the challenge of increasing the handling efficiency and minimizing post-harvest food losses. Those challenges can be resolved by intelligent food logistics technology, including sensor technology to monitor the logistic conditions, radio frequency identification (RFID) and GPS technology to improve transport modalities, new warehouse management approaches, shelf life models, or the combination of one or more of these aspects [10, 11]. The importance of these aspects is of crucial importance in highly perishable fruits such as peaches and nectarines. The peach and nectarine cold chain is complex with high information discrepancy. Different possible combinations of temperature, relative humidity, CO\({}_{2}\), O\({}_{2}\), and ethylene concentrations occurring in cold chain may significantly affect fruit perishability, metabolic changes, and cause unpredictable variability in fruit quality, such as the loss of fruit firmness, and the onset of physiological disorders and decay [12, 13, 14, 15]. Therefore, it is urgent to analyze the dynamic characteristics of peaches and nectarines in cold chain environments by intelligent monitoring technology, and to improve the traceability and transparency of the peaches and nectarines in cold chain and guarantee the quality and safety of the fruits. Though there are many environmental factors that affect the quality and safety of peach and nectarine cold chains, temperature, relative humidity, and CO\({}_{2}\) level are considered to be the main factors [16, 17, 18, 19]. Among them, temperature is the key factor [10] that directly affects the respiration rate of the peaches and nectarines and the antioxidative activity of the fruits. Suitable temperature management is an effective technology for slowing this ripening and reducing decay development after harvest [20, 21]. Humidity levels that are higher than an optimum value promote the growth of microorganisms and result in abnormal splitting of peaches and nectarines, and humidity levels that are lower than the optimum value can result in wilting, brown rot, and the decrease of firmness of fruits, as well as damage to the appearance of fruit tissue [22, 23]. CO\({}_{2}\) and O\({}_{2}\) concentrations strongly affect fruit metabolism and fruit shelf life [10], therefore concentration levels must be monitored to avoid postharvest losses. Peaches and nectarines are characterized by exhibiting a sharp rise in CO\({}_{2}\) and ethylene production at the onset of ripening accompanied with the increase of respiration rate, which leads to dramatic changes in fruit quality [24, 25]. It is critical to monitor these factors in real time in order to adjust the temperature, relative humidity, and CO\({}_{2}\) at optimal levels during the cold chain. One of the best solutions and an inevitable trend for enabling real time cold chain monitoring is the implementation of the Wireless Sensor Network (WSN), which is considered to be a cost-effective sensor and communications technology with low energy consumption and advanced networking capabilities for monitoring objects and transmitting information to the end-user via a wireless and multi-hop network [26, 27, 28, 29, 30].