Lower default MinimumPoW

This commit lowers the default minimum pow for both Waku & Whisper.
We need to override the value as mobile clients have this already stored
in the database.

This is done in order to support sending of images.

params/config.go

@@ -633,6 +633,16 @@ func (c *NodeConfig) UpdateWithMobileDefaults() {
 	if c.APIModules == "" {
 		c.APIModules = "net,web3,eth"
 	}
+
+	// Override defaultMinPoW passed by the mobile
+	if c.WakuConfig.Enabled {
+		c.WakuConfig.MinimumPoW = WakuMinimumPoW
+	}
+
+	if c.WhisperConfig.Enabled {
+		c.WakuConfig.MinimumPoW = WhisperMinimumPoW
+	}
+
 }
 
 // NewNodeConfigWithDefaultsAndFiles creates new node configuration object

params/defaults.go

@@ -22,13 +22,13 @@ const (
 	DefaultGas = 180000
 
 	// WhisperMinimumPoW amount of work for Whisper message to be added to sending queue
-	WhisperMinimumPoW = 0.001
+	WhisperMinimumPoW = 0.000002
 
 	// WhisperTTL is time to live for messages, in seconds
 	WhisperTTL = 120
 
 	// WakuMinimumPoW amount of work for Whisper message to be added to sending queue
-	WakuMinimumPoW = 0.001
+	WakuMinimumPoW = 0.000002
 
 	// WakuTTL is time to live for messages, in seconds
 	WakuTTL = 120