ModBusWiFi

ModBusWiFi is an Android tool for working with Modbus devices over a WiFi connection.
Use it to connect your phone to industrial controllers, inverters, power supplies, test equipment, and other Modbus-compatible devices through a TCP serial bridge, WiFi-to-RS485 adapter, or an ESP8266 module running esp-link.
Typical connection:
Android phone -> WiFi -> ESP8266 / TCP serial bridge -> RS485 -> Modbus device
Main features:
Connect to a device by IP address and port.
Work with Modbus RTU and Modbus ASCII through a WiFi serial bridge.
Read holding registers.
Send register write commands.
Configure quick ON/OFF commands.
Create snippets for frequently used commands.
View responses in HEX.
Save communication logs.
Add timestamps to received data.
ModBusWiFi is useful for engineers, technicians, makers, and anyone who needs a simple mobile tool for testing or controlling Modbus devices without a laptop.
The app can be used with many TCP-to-serial or WiFi-to-RS485 adapters. It can also work with low-cost ESP8266 modules when configured as a WiFi serial bridge.
Setup guide, ESP8266 firmware sources, and connection examples:
https://deeperhole.com/modbuswifi
Note: third-party firmware and tools are provided by their respective authors. The setup page links to official sources whenever possible.