sorry , please first open the shield and sent 1. “AT+IPR=19200” 2. and then a hex :0x0d( carriage return ), sure, you need to dowmload the sketch on garden.seeedstudio.com/ firstly.
that is , in program, serial input a command :“AT+IPR=19200\r”, if it still not works and do not return an “ok”, sent an emil to me : [email protected]