[10], in their paper on \"_Characterization and Performance of a Thermal Camera Communication System_\", focus on a comprehensive characterization of the Peltier-Thermal camera pair in terms of bandwidth, achievable data rate using on-off-keying (OOK) modulation, and considering noise characteristics and energy efficiency. A comparison against the current state-of-the-art OCC technology is also provided, showing that TCC is a promising technology suitable for sensor networks. In the next paper on \"_Optical Camera Communications for IoT-Rolling-Shutter Based MIMO Scheme_with Grouped LED Array Transmitter_\", [PERSON] et al. [11] investigate the rolling shutter-based multiple-input multiple-output OCC scheme for the Internet of Things (IoT) applications. A simplified design of multi-channel transmitter using small 8 \(\times\) 8 distributed LED array, based on grouping of LEDs, is proposed and tested for flicker-free transmission. [PERSON] et al. [12], in their paper on \"_Optical Camera Communication as an Enabling Technology for Microalgae Cultivation_\", show how the OCC technology can be used as a potential application in microalgae production plants. Authors proposed a proof-of-concept prototype consisting of an artificial lighting photobioreactor, which optimizes the culture's photosynthetic efficiency, while transmitting OOK signals to a rolling-shutter camera and analyzing node arrangements in a real facility, considering node visibility, channel capacity, and space exploitation. In the next paper on \"_Wireless Sensor Networks Using Sub-Pixel Optical Camera Communications: Advances in Experimental Channel Evaluation_\", [PERSON] et al. [13] propose a unique utilization of the novel topology of sub-pixel projection of multiple transmitters over the receiver, using small optical devices as a solution in OCC, i.e., re-using the camera for communication purposes as well as video-monitoring, and providing results from testing within an outdoor wireless sensor network. [PERSON] et al. [14], in the paper on \"_The Utilization of Artificial Neural Network Equalizer in Optical Camera Communications_\", outline more in-depth methods of signal processing within OCC. An artificial neural network-based equalizer is proposed and experimentally evaluated for the constant power 4-level pulse amplitude modulation, demonstrating improvement in the OCC system performance. [PERSON] et al. [15], in the paper on \"_Design and Experimental Characterization of a Discovery and Tracking System for Optical Camera Communications_\", focus on the real-time detection of the source within the image. The proposed receiver architecture combines discovery and tracking algorithms that analyze spatial features of a custom RGB LED transmitter matrix, highlighted in the scene by varying the cameras' exposure time. Another very promising research area within VLC is visible light positioning (VLP), which allows one to reach precision positioning in terms of centimeters, which is a tremendous advance, especially in an indoor environment, as compared to the traditional RF-based positioning systems. [PERSON] et al. [16], in the paper on \"_A Comprehensive Study on Light Signals of Opportunity for Subdecimetre Unmodulated Visible Light Positioning_\", discuss signal processing using the LED's characteristic frequency as a discriminative feature in photodiode-based received signal strength (RSS) unmodulated VLP. [PERSON] et al. [17], in the paper on \"_Experimental Evaluation of Machine Learning Methods for Robust Received Signal Strength-Based Visible Light Positioning_\", provide an experimental evaluation of machine-learning methods for robust RSS-based VLP. The methods use relative RSS-based input features to provide a more reliable localization system, when unknown changes in the received signal strength occur due to PD aperture obfuscation or LED dimming. In the next paper on \"_An Indoor Visible Light Positioning System Using Tilted LEDs with High Accuracy_\", by [PERSON] et al.