Gude HTTP over serial

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HTTP over Serial


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


Example 1:

 ./hosd --port /dev/ttyS0 --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
                 ]
             ]
         ]
     ]
 }