Gude HTTP over serial

HTTP over Serial

• offers the EPC HTTP Interface over serial interface

Serial interface Paramaters

• 115200 8N1
  • 115200 Baud
  • 8bits
  • no parity
  • one stop bit

Packet format:

• [STX][message-string][ETX][CRX]
  • [STX] start of text, (0x02)
  • [message string] (CGI in, JSON out)
  • [ETX] end of text (0x03)
  • CRC: 2 bytes xmodem CRC

Demo Application

• hosd (Http Over Serial Demo)
  • Win32 Download
  • Qt/Cpp Sources

Example 1:

 hosd.exe --port com1 --cgi "statusjsn.js?components=16384&svt=1&svi=1&svf=1&brief=1"

 request -> [STX] statusjsn.js?components=16384&svt=1&svi=1&svf=1&brief=1 [ETX] [CRC:0x5d49]
 answer  <- [STX] { "sensor_values":[[[1,1,null,1],[[236.900]]]],"eof":1 } [ETX] [CRC:0xa06a]
 Total messages: 1

Example 2:

 ./hosd --port /dev/ttyS0 --cgi "statusjsn.js?components=16384&svt=1&svi=1&svf=1&brief=1" --batch | python -m json.tool

 {
     "eof": 1,
     "sensor_values": [
         [
             [
                 1,
                 1,
                 null,
                 1
             ],
             [
                 [
                     236.75
                 ]
             ]
         ]
     ]
 }