Hi Ricky. It is very difficult to explain all the protocols mentioned and give the differences between them in a response to a single query. We have tried our best to explain and differentiate between all in brief. RS-485 is responsible for point-to-point communication between the electrical devices. It can work for long distances by using long cables and it supports multiple devices on the same bus. Modbus is a serial communication used with PLCs. It is a method used to transmit information over serial lines between devices. Modbus is a protocol type whereas RS-485 defines protocol’s signal level. MQTT is a messaging protocol on top of TCP/IP used for sending messages. Zigbee carries a small amount of data over a short distance and consumes very little power. Zigbee and MQTT integrate well and Zigbee2MQTT is used in many home automation
HI. Yes BLE mesh can also be used. Choosing a methodology depends on the application, needs, budgets, speed, reliability, etc. For example if your devices are battery dependent Zigbee may be considered as a better choice, on the other hand if you have a larger IoT based network for industrial applications BLE mesh may be considered as a better choice.
Hi Ahmad, It depends on the Application you are trying to build. If it just a simple project, that needs to send data over the air, without the intention for scalability, security, interoperability & reliability, then you can use the RF433 Modules. On the other hand if you are trying to build a true IoT System that need to be build across a lot of nodes, ZigBee can support more than 60000 nodes in a single network, through its Mesh Topology. Also for mission critical application, where fast and reliable data transfer is a must, ZigBee provides as low as 30ms response time with proper acknowledgment messages, to ensure that the data has reached its destination, whereas the RF433 doesn't have that feature. Moreover, ZigBee supports Full Duplex Communication that too encrypted by 128 bit AES, which is lacking in the RF. Furthermore, unlike what you have said RF433 doesn't take less power than ZigBee. It all depends on the number of packets being sent, and the polling frequency. You can refer this paper to see the graphs of power consumption. www.researchgate.net/figure/Energy-Consumption-per-Week-for-RF433-ZigBee-Bluetooth-Wi-Fi-Using-Communication_fig2_311841905 .We hope this was helpful. Thank You
Hi Smit Zaveri BLE has been around for a long time, and latest updates looks really like permission for upto 100m real life range applications. Currently as most Smartphones ship with BLE already, it has the most impact as of now. But reliability and range is far superior with ZigBee. Moreover industry giants like Amazon, Google, Samsung etc have joined hands to make ZigBee the standard for indoor IoT by forming the Matter Alliance. Most of these smart home devices come with gateway bridges that can convert BLE connections to ZigBee. We hope this was helpful. Thank You, MAKERDEMY SUPPORT TEAM
