Test another wallet with lightwalletd + Zebra

[conradoplg]

Motivation

Same rationale as #4450, but since ZecWallet might get deprecated, we might want to test with another wallet.

Specifications

Designs

Choose/experiment with other wallets, and test it. One natural choice would be Nighthawk, but it's mobile-only, which may make testing awkward (though you can run it in an Android emulator)

Related Work

[conradoplg]

I tested successfully with Nighthawk android with upstream lightwalletd. It showed my balance, and allowed me to send transaction and showed received transactions.

Since it connects to HTTPS, you'll need a certificate for the lightwalletd server.

• I created one with mkcert :

mkcert <YOUR_IP> 127.0.0.1 localhost

(Substitute with the IP of the machine you're running lightwalletd.)

• Rename the cert and key to cert.pem and cert.key, put them in the same folder you will run lightwalletd (or point to the files using the lightwalletd CLI, check its help)
• Start the lightwalletd server WITHOUT ----no-tls-very-insecure

Then run Nighthawk:

• Checkout source and follow the README instructons (install Android Studio).
• If an Gradle error shows up, accept the fix
• Change the build variant (bottom left tab) to zcashtestnetDebug
• Change the manifest per these instructons (e.g. add a android:networkSecurityConfig="@xml/network_security_config" and create a xml/network_security_config.xml file with the contents in the link
• Copy the root CA from mkcert (it's in the path reported by mkcert -CAROOT) to raw/debug_cas (i.e. debug_cas is the name of the file)
• Pair your phone on the device manager (a simulator doesn't work; the app shows an error if you use one)
• Run the app
• Change the lightwalletd server to your IP

[conradoplg]

Done, someone reproducing the steps is not needed at this time, Adi might help us test this further