Fix I2C config parameter interpretation

The current implementation pulls bytes out of the sysex buffer, regardless of whether or not the user specified such bytes.

Author: zfields

examples/StandardFirmata/StandardFirmata.ino

@@ -586,7 +586,7 @@ void sysexCallback(byte command, byte argc, byte *argv)
     case I2C_CONFIG:
       delayTime = (argv[0] + (argv[1] << 7));
 
-      if (delayTime > 0) {
+      if (argc > 1 && delayTime > 0) {
         i2cReadDelayTime = delayTime;
       }
 

examples/StandardFirmataBLE/StandardFirmataBLE.ino

@@ -603,7 +603,7 @@ void sysexCallback(byte command, byte argc, byte *argv)
     case I2C_CONFIG:
       delayTime = (argv[0] + (argv[1] << 7));
 
-      if (delayTime > 0) {
+      if (argc > 1 && delayTime > 0) {
         i2cReadDelayTime = delayTime;
       }
 

examples/StandardFirmataChipKIT/StandardFirmataChipKIT.ino

@@ -588,7 +588,7 @@ void sysexCallback(byte command, byte argc, byte *argv)
     case I2C_CONFIG:
       delayTime = (argv[0] + (argv[1] << 7));
 
-      if (delayTime > 0) {
+      if (argc > 1 && delayTime > 0) {
         i2cReadDelayTime = delayTime;
       }
 

examples/StandardFirmataEthernet/StandardFirmataEthernet.ino

@@ -666,7 +666,7 @@ void sysexCallback(byte command, byte argc, byte *argv)
     case I2C_CONFIG:
       delayTime = (argv[0] + (argv[1] << 7));
 
-      if (delayTime > 0) {
+      if (argc > 1 && delayTime > 0) {
         i2cReadDelayTime = delayTime;
       }
 

examples/StandardFirmataPlus/StandardFirmataPlus.ino

@@ -611,7 +611,7 @@ void sysexCallback(byte command, byte argc, byte *argv)
     case I2C_CONFIG:
       delayTime = (argv[0] + (argv[1] << 7));
 
-      if (delayTime > 0) {
+      if (argc > 1 && delayTime > 0) {
         i2cReadDelayTime = delayTime;
       }
 

examples/StandardFirmataWiFi/StandardFirmataWiFi.ino

@@ -675,7 +675,7 @@ void sysexCallback(byte command, byte argc, byte *argv)
     case I2C_CONFIG:
       delayTime = (argv[0] + (argv[1] << 7));
 
-      if (delayTime > 0) {
+      if (argc > 1 && delayTime > 0) {
         i2cReadDelayTime = delayTime;
       }