chrissnell

package main

import (
	"encoding/json"
	"fmt"
)

/*
JSON looks like this:

chrissnell

##
## Revinate Cloud Instance Provisioning
## Chris Snell <chris.snell@revinate.com>
##

# We only run this block if the file /etc/firstboot exists
if [ -f /etc/firstboot ]; then

    # These are the URLs for the EC2-compatible metadata service running in our cloud
    HOSTNAME_METADATA="http://169.254.169.254/2009-04-04/meta-data/hostname"

chrissnell

sudo tcpdump -Xi wlan2 port 14580
tcpdump: verbose output suppressed, use -v or -vv for full protocol decode
listening on wlan2, link-type EN10MB (Ethernet), capture size 65535 bytes
11:29:03.142268 IP utila.island.nu.32949 > aprs.nh6z.net.14580: Flags [S], seq 3333231990, win 14600, options [mss 1460,sackOK,TS val 127420093 ecr 0,nop,wscale 3], length 0
        0x0000:  4500 003c 53cb 4000 4006 8d8f 0a32 0019  E..<S.@.@....2..
        0x0010:  c6b2 8864 80b5 38f4 c6ad 1576 0000 0000  ...d..8....v....
        0x0020:  a002 3908 5990 0000 0204 05b4 0402 080a  ..9.Y...........
        0x0030:  0798 46bd 0000 0000 0103 0303            ..F.........
11:29:03.176173 IP aprs.nh6z.net.14580 > utila.island.nu.32949: Flags [S.], seq 196851892, ack 3333231991, win 14480, options [mss 1460,sackOK,TS val 939309337 ecr 127420093,nop,wscale 3], length 0
        0x0000:  4520 003c 0000 4000 3506 ec3a c6b2 8864  E..<..@.5..:...d

chrissnell

2014-06-09 18:23:27.481 NW5W-1    R KD0SOR-7>TW4WPQ,JUPITR*,WIDE1*,WIDE2-1:`2)^]lh7>/`"49}_
2014-06-09 18:23:51.271 APRSIS    R NW5W-10>APRS,TCPIP*,qAC,T2CMH:@091824z4715.66N/12228.20W_048/001g003t064r000p000P000b10210h63 http://fifestreet.com weewx-VantagePro
2014-06-09 18:23:57.391 NW5W-1    T NW5W-1>APRX28,WIDE2-2:!4715.68N/12228.20W-aprx iGate http://nw5w.com
2014-06-09 18:24:51.482 APRSIS    R NW5W-10>APRS,TCPIP*,qAC,T2QUEBEC:@091825z4715.66N/12228.20W_359/002g003t064r000p000P000b10209h65 http://fifestreet.com weewx-VantagePro
2014-06-09 18:25:08.711 NW5W-1    R K7FRC>T7RYRX,W7PFR-1*,WIDE1*,WIDE2-1:`2.^\l#4>/'"53}|"6%X'k|!wSm!|3
2014-06-09 18:25:27.613 NW5W-1    R WW7RA>APRS,BALDI*,WIDE2-1:!4732.88N/12248.45W_>WW7RA Digi & Remote Wx Sta
2014-06-09 18:25:28.514 NW5W-1    R BALDI>APRX27:!4713.13NI12150.61W&PHG7830/W2,WAn-N,Baldi Mtn N7FSP
2014-06-09 18:25:43.427 NW5W-1    R TWOODS>APOT21,SOMTN*,WIDE1*,JUPITR*,WIDE2-1:!4645.38N/12207.08W#KD7ISZ
2014-06-09 18:25:51.180 APRSIS    R NW5W-10>APRS,TCPIP*,qAC,T2T

chrissnell

mycall  NW5W-1
myloc lat 4715.68N lon 12228.20W

<aprsis>
   passcode NNNN
   server oregon.aprs2.net
   filter b/NW5W-10
   heartbeat-timeout   0
</aprsis>

chrissnell

.. igate from aprsis
interface_receive_3rdparty() aif=0x3397c, aif->digicount=1
pbuf_alloc(118,115) -> 0xb6f66000
parse_aprs_uncompressed position ok: lat 47.261 lng -122.470
.. parse_aprs() rc=OK  type=0x8021 srcif=APRSIS tnc2addr='NW5W-10>APRS:@091933z4715.66N/12228.20W_009/002g004t066r000p000P000b10207h53 http://fifestreet.com weewx-VantagePro'  info_start='@091933z4715.66N/12228.20W_009/002g004t066r000p000P000b10207h53 http://fifestreet.com weewx-VantagePro'
pbuf_free(0xb6f66000)
parse_aprs_uncompressed position ok: lat 47.261 lng -122.470
.. parse_aprs() rc=OK  type=0x8021 srcif=APRSIS tnc2addr='NW5W-10>APRS:@091933z4715.66N/12228.20W_009/002g004t066r000p000P000b10207h53 http://fifestreet.com weewx-VantagePro'  info_start='@091933z4715.66N/12228.20W_009/002g004t066r000p000P000b10207h53 http://fifestreet.com weewx-VantagePro'
## produce 3rd-party frame for transmit:
ax25hdr 82 a0 a4 a6 40 40 60 9c|ae 6a ae 40 40 62 ae 92|88 8a 64 40 03  = APRS  0N|W5W  1WI|DE2 .

chrissnell

Byte#	HexVal	Char	Char>>1	Binary
-----	------	----	-------	------
   0 	0xc0 	À 	`	11000000
   1 	0x0 	 		00000000
   2 	0x82 	‚ 	A	10000010
   3 	0xa0 	  	P	10100000
   4 	0xb4 	´ 	Z	10110100
   5 	0x60 	` 	0	01100000
   6 	0x60 	` 	0	01100000
   7 	0x62 	b 	1	01100010

chrissnell

mycall  NW5W-1
myloc lat 4715.68N lon 12228.20W

<aprsis>
   passcode NNNN
   server northwest.aprs2.net
   filter b/NW5W-10
   heartbeat-timeout   0   
</aprsis>

chrissnell

// A little blurb I wrote to toggle something on and off, always making sure to toggle off before shutdown

	toggle := make(chan bool, 1)

	outputPin, err := hwio.GetPinWithMode(pin, hwio.OUTPUT)
	if err != nil {
		log.Printf("Error getting GPIO pin: %v\n", err)
	}

	go func() {

chrissnell

# Testing packages.
ok  	cmd/addr2line	0.423s
?   	cmd/cgo	[no test files]
ok  	cmd/fix	0.013s
ok  	cmd/go	0.014s
ok  	cmd/gofmt	0.053s
ok  	cmd/nm	0.521s
ok  	cmd/objdump	2.551s
ok  	cmd/pack	2.934s