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If you want to control device that are already commissioned by the gateway device, you must:
1.a.- Know the GroupID of these lights. If you do not know it, you can send a zclGeneral_SendGroupGetMembershipRequest with GroupCount=0 (ZCL 3.6.2.3.4) to get the groups that these lights have.
1.b.- Switch device must have in each button a zclGeneral_SendSceneRecall with the 2 different scenes (SCENE1 and SCENE2), you need to set the message as indirect and the short address set to the Group ID from 'a'.
