gtth

Fix Connection timeout from issue #367

1

I quickly implemented the RTU get/set functions proposed as Option1 in the issue.

Connection timeout caused by delay after write operation in rtu_send

4

## libmodbus version libmodbus-3.4.1 ## OS and/or distribution and Environment Linux 3.4.7 compiled for ARM Configuration: RTU with 9600 bauds (N, 8, 1) Modbus meter Garo with **response time 4ms**!...