lyxer123

In response to the above situation, this happens to my program from time to time, but after I use the metamask wallet to send data once, my original program can...

I use 4G wireless module to post the eth_sendRawTransaction：this error {\n \"jsonrpc\" : \"2.0\",\n \"id\" : 60246,\n \"error\" : {\n \"code\" : -32602,\n \"message\" : \"Invalid params\"\n }\n} occured many...

**THIS SOURCE CODE CAN NOT COMPILED.!!!!!!!** /* * The example shows how to work with a single RS485 interface using Modbus RTU and configure by ModbusConfig. ESP8266 microcontroller */ #include...

**COMPILE ERROR** C:\Users\Administrator\Desktop\ModbusConfig_SingleRS485\ModbusConfig_SingleRS485.ino: In function 'void processModbusConfig(String)': ModbusConfig_SingleRS485:186:10: error: 'Connection' was not declared in this scope for (Connection& connection : modbusCfg.connections) //Only one Slave settings supported in the example ^...