i4things now officially support 433Mhz, 868Mhz and 915Mhz - default is 868Mhz
At the Node side to switch between frequencies please pass the requencyRange parameter (supported options are : IoTThing_433, IoTThing_868, IoTThing_915)
On the gateway side you also need to choose a appropriate frequency:
For nodes on 433 Gateway can be : 433.1, 433.3, 433.5
For nodes on 868 Gateway can be : 868.1, 868.3, 868.5
For nodes on 915 Gateway can be : 915.1, 915.3, 915.5