Documenting test of HelloPerso sample app.

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Christopher Sanborn 2017-08-02 18:04:21 -04:00
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# Notes on Hello Perso sample app.
Hello Perso is a sample app from the LedgerHQ repository
[blue-sample-apps](https://github.com/LedgerHQ/blue-sample-apps). It's
stated purpose is to be a "a simple application showing the UI and master
seed derivation."
# Compiling:
Compiles fine inside Docker image, as in the process described in the
[Getting Started](http://ledger.readthedocs.io/en/latest/nanos/setup.html)
tutorial (which takes you through the Hello World tutorial).
In extracting the hex-encoded compiled app from the docker container to my
local machine, I changed the app name as follows:
``` bash
sudo docker cp [container_id]:/home/blue-sample-apps/blue-app-helloperso/bin/app.hex perso-app.hex
```
I then loaded the app onto the Nano S using the following, and then
discovered a problem:
``` bash
python -m ledgerblue.loadApp --targetId 0x31100002 --apdu --fileName perso-app.hex --appName HelloPerso --appFlags 0x00 --icon ""
```
The problem: Hello Perso app requires the `APPLICATION_FLAG_GLOBAL_PIN`
permission flag. I had just copied and pasted my loadApp command line for
HelloWorld and changed the app name and image name. But the `--appFlags`
argument needed to be changed to `--appFlags 0x40`.
Symptoms: With the wrong permissions set, even though the app was
successfuly loaded onto the device, it would freeze the Nano every
time I started the app, requiring a power-cycle to get back to the
dashboard.
The correct load command was:
``` bash
python -m ledgerblue.loadApp --targetId 0x31100002 --apdu --fileName perso-app.hex --appName HelloPerso --appFlags 0x40 --icon ""
```
### How to remove apps:
Problem Two: Repeating the loadApp() command with the correct flags failed
because the app already existed on the device. It apparently won't
overwrite. Thus I had to find a delete command, which fortunately is
referenced in the Makefile. To manually delete the app, this is the
command:
``` bash
python -m ledgerblue.deleteApp --targetId 0x31100002 --appName HelloPerso
```
### Permission flags defined:
The `0x40` permission flag that was needed is defined by macro constant
`APPLICATION_FLAG_GLOBAL_PIN` in
[nanos-secure-sdk/include/os.h](https://github.com/LedgerHQ/nanos-secure-sdk/blob/master/include/os.h),
along with many other application flags.