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RAK477 Instruction Manual
Instruction for returned value
Parameter
Forma
Length(byte)
Instruction
The command is successfully carried out
OK
ASCII
2
OK
/r/n
ASCII
2
End character
The command is unsuccessfully carried out
ERROR
ASCII
5
ERROR
<CODE>
HEX
0XFE=-2
Invalid stored information
\r\n
ASCII
2
End character
Remark
4.10
Upgrading of serial port firm ware
4.10.1
Enter into the upgrading mode
Command
at+upgrade\r\n
Description
The command is used to set the module to enter into the upgrading mode.
1. The host computer (host MCU) send at+upgrade\r\n to the module, and request
to enter into the upgrading mode.
2. Until the command is executed successfully, the module returns “OK”, the host
computer (host MCU) sends “u” to confirm entering into the upgrading mode.
If the module executing the command did not return "OK", return to carry out
