Add compliance mode to limit trasmitter power to FCC certified values

SlimeVR · Nov 8, 2023 · 8a00376 · 8a00376
1 parent 14f2752
commit 8a00376
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Showing 2 changed files with 24 additions and 0 deletions.
diff --git a/src/debug.h b/src/debug.h
@@ -80,6 +80,12 @@
 
 #define I2C_SPEED 400000
 
+#define COMPLIANCE_MODE true
+#define USE_ATTENUATION COMPLIANCE_MODE && ESP8266
+#define ATTENUATION_N 10.0 / 4.0
+#define ATTENUATION_G 14.0 / 4.0
+#define ATTENUATION_B 40.0 / 4.0
+
 // Send inspection packets over the network to a profiler
 // Not recommended for production
 #define ENABLE_INSPECTION false

diff --git a/src/network/wifihandler.cpp b/src/network/wifihandler.cpp
@@ -76,6 +76,9 @@ void WiFiNetwork::setUp() {
     WiFi.persistent(true);
     WiFi.mode(WIFI_STA);
     #if ESP8266
+        #if USE_ATTENUATION
+            WiFi.setOutputPower(20.0 -  ATTENUATION_N);
+        #endif
     WiFi.setPhyMode(WIFI_PHY_MODE_11N);
     #endif
     WiFi.hostname("SlimeVR FBT Tracker");
@@ -149,6 +152,9 @@ void WiFiNetwork::upkeep() {
                         // But only if there are credentials, otherwise we just waste time before
                         // switching to hardcoded credentials.
                         if (WiFi.SSID().length() > 0) {
+                            #if USE_ATTENUATION
+                                WiFi.setOutputPower(20.0 -  ATTENUATION_G);
+                            #endif
                             WiFi.setPhyMode(WIFI_PHY_MODE_11G);
                             setStaticIPIfDefined();
                             WiFi.begin();
@@ -165,6 +171,9 @@ void WiFiNetwork::upkeep() {
                     #if defined(WIFI_CREDS_SSID) && defined(WIFI_CREDS_PASSWD)
                         // Try hardcoded credentials now
                         #if ESP8266
+                            #if USE_ATTENUATION
+                                WiFi.setOutputPower(20.0 -  ATTENUATION_N);
+                            #endif
                             WiFi.setPhyMode(WIFI_PHY_MODE_11N);
                         #endif
                         setStaticIPIfDefined();
@@ -178,6 +187,9 @@ void WiFiNetwork::upkeep() {
                 case SLIME_WIFI_HARDCODE_ATTEMPT: // Couldn't connect with second set of credentials
                     #if defined(WIFI_CREDS_SSID) && defined(WIFI_CREDS_PASSWD) && ESP8266
                         // Try hardcoded credentials again, but with PHY Mode G
+                        #if USE_ATTENUATION
+                            WiFi.setOutputPower(20.0 -  ATTENUATION_G);
+                        #endif
                         WiFi.setPhyMode(WIFI_PHY_MODE_11G);
                         setStaticIPIfDefined();
                         WiFi.begin(WIFI_CREDS_SSID, WIFI_CREDS_PASSWD);
@@ -190,6 +202,9 @@ void WiFiNetwork::upkeep() {
                 case SLIME_WIFI_SERVER_CRED_ATTEMPT: // Couldn't connect with server-sent credentials.
                     #if ESP8266
                         // Try again silently but with 11G
+                        #if USE_ATTENUATION
+                            WiFi.setOutputPower(20.0 -  ATTENUATION_G);
+                        #endif
                         WiFi.setPhyMode(WIFI_PHY_MODE_11G);
                         setStaticIPIfDefined();
                         WiFi.begin();
@@ -201,6 +216,9 @@ void WiFiNetwork::upkeep() {
                 case SLIME_WIFI_SERVER_CRED_G_ATTEMPT: // Or if couldn't connect with server-sent credentials
                     // Return to the default PHY Mode N.
                     #if ESP8266
+                        #if USE_ATTENUATION
+                            WiFi.setOutputPower(20.0 -  ATTENUATION_N);
+                        #endif
                         WiFi.setPhyMode(WIFI_PHY_MODE_11N);
                     #endif
                     // Start smart config