On join

The client will send you this information on join on the LMC channel

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{  
   "version": "3.4.2",
   "ccp": {  
      "enabled": true,
      "version": 2
   },
   "shadow":{  
      "enabled": true,
      "version": 1
   },
   "addons": [  
      {  
         "uuid": "8a2eb0b0-5df9-4687-b36f-df2258b61062",
         "name": "Name of the Addon"
      }
   ],
   "mods": [
      {  
         "hash":"sha256:9aba15fe05724639ad4b4665e1a76970fd7f740bf751eaa708e90287ce3a171d",
         "name":"name_of_the_addon.jar"
      }
   ]
}