Update readme

README.md

@@ -16,13 +16,23 @@ program does _not_ publish its result on dbus for use by victron, only prints ou
 for your verification. It should be relatively safe to test with.
 
 If the `sma_home_manager_printer` works and shows consistent/reliable result, then you can
-install this in the same way. Download the latest release and copy.
+install this in the same way.
+
+*You don't need to compile the source code* if you don't want to (see compiling below). Head over
+to the [releases](https://github.com/mitchese/shm-et340/releases) and download the latest version.
+then:
+
+  * Unzip the release zipfile, which contains the "shm-et340" binary compiled for ArmV7
+  * Review [how to setup root access](https://www.victronenergy.com/live/ccgx:root_access) on the device
+  * Use SCP (`scp ./shm-et340 root@192.168.xxx.xxx:`) or WinSCP to copy the shm-et340 to the Venus
+  * SSH in to the venus (`ssh root@192.168.xxx.xxx`) and finally run it `./shm-et340`)
 
 While this is running, you should see correct values for a grid meter in your Venus UI:
 
 ![Venus GX UI](img/meter_sample.gif)
 
 On the console of your GX device, you should see regular updates, around once per second:
+
 ```
 root@victronvenusgx:~# ./shm-et340
 INFO[0000] Successfully connected to dbus and registered as a meter... Commencing reading of the SMA meter
@@ -34,6 +44,39 @@ INFO[0002] Meter update received: 6677.15 kWh bought and 3200.45 kWh sold, 686.3
 If this does not work, try to `export LOG_LEVEL="debug"` first, which should print out significantly more
 information on what's happening.
 
+# Starting at boot
+
+The above steps will start it once, which will run until the next reboot. Doing the following will start it on every boot
+
+Thanks to [ricott](https://github.com/ricott) for the tip here. The full description of how to start on boot
+can be found [here](https://www.victronenergy.com/live/ccgx:root_access). Basically, add the call to `/data/rc.local`.
+
+Mine tried to start before the network was up, which resulted in an error and it not starting. To 'fix' this, I just wait 15s in the
+rc.local before trying to start the script ... not great but it works.
+
+```
+root@beaglebone:~# cat /data/rc.local
+!#/bin/bash
+
+sleep 15
+setsid /data/home/root/shm-et340 > /dev/null 2>/dev/null &
+
+root@beaglebone:~# ls -l /data/rc.local
+-rwxr-xr-x    1 root     root            81 Feb 18 15:38 /data/rc.local
+
+```
+
+# Compiling from source
+
+For windows, and more detailed instructions, head on over to [Schnema1's fork](https://github.com/Schnema1/sma_home_manager_printer)
+
+To compile this for the Venus GX (an Arm 7 processor), you can easily cross-compile with the following:
+
+`GOOS=linux GOARCH=arm GOARM=7 go build`
+
+
+# Additional Info
+
 For more details, see the thread on the Victron Energy community forums here:
 
 https://community.victronenergy.com/questions/49293/alternative-to-et340-mqtt-sma-home-manager.html
@@ -42,5 +85,5 @@ https://community.victronenergy.com/questions/49293/alternative-to-et340-mqtt-sm
 
   - [ ] Setup a start/stop script and describe how to install as a system service
   - [ ] Make builds and releases automatic
-  - [ ] Install and test with a real ESS / Multigrid
   - [ ] Test against fw upgrades of the Venus OS
+  - [ ] Handle a power failure of the Home manager (or other network issues preventing updates)