All of the codes are for vanilla campaign... some may work on other campaigns... so ya...

Upon starting the game, you will need to click "Start new campaign" not any other option since it does not work.
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Here, you will choose a mod that you have installed.
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Here, you will choose what settings you want.
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Here, you will see at top right of this settings where chats buttons are.
T = team chat
Enter = global chat
Y = squad chat
Then you press enter to sent the message out.
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Here, you see a campaign that i started within 5 seconds.
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And here, you see the aftermath of the codes i entered...
I did not screenshot me typing in the chat...

Here's the list I found
PS. Everything spawns to the right of your character.
The slider when creating a new solo campaign can affect the /promote and /rp... the slider to modify the xp gain and rp gain

Codes with " ^1 " at the end of description requires testing to see what the code does

1. /promote [gives you 8000 xp [depending on the xp slider]
   
2. /rp [gives you 2500 rp [depending on the rp slider]
   
3. /G36 [spawns a 5 G36 weapon]
   
4. /tank [spawns a a tank... may work with mods that has remodel the tank]
   
5. /jeep [spawns a jeep]
   
6. /humvee [spawns a humvee]
   
7. /apc [spawns a apc... may work with mods that remodel the apc]
   
8. /tow [spawns a tow]
   
9. /c4 [spawns a c4 that been thrown]
   
10. /m72 [spawns 4 M72 Law]
    
11. /laptop [spawns a laptop]
    
12. /briefcase [spawns a briefcase]
    
13. /teddybear [spawns a teddy bear]
    
14. /cargo [spawns a cargo truck]
    
15. /quad [spawns a quad]
    
16. /javelin [spawns a javelin]
    
17. /mortar [spawns a mortar deploy]
    
18. /restart [restart the map you are in]
    
19. /0_win [win the map you are on]
    
20. /DC [spawn cover deploy]
    
21. /create_vehicle [spawns a secret cargo vehicle]
    
22. /dgl [spawns a grenade launcher deploy]
    
23. /dmg [spawns a machine gun deploy]
    
24. /dminig [spawns a minigun deploy]
    
25. /friend [spawns a friendly unit]
    
26. /foe [spawns a enemy unit]
    
27. /lw [spawns a lone wolf unit]
    
28. /gb1 [spawns a blue box]
    
29. /gb2 [spawns a purple box]
    
30. /gb3 [spawns a titan box]
    
31. /sniper [spawns a friendly sniper]
    
32. /cb1 [spawns community box 1]
    
33. /cb2 [spawns community box 2]
    
34. /cb3 [spawns a community box 3]
    
35. /lottery [spawns a lottery ticket]
    
36. /M29 [spawns in 44 Magnum]
    
37. /mg [spawns in a deployed mg]
    
38. /kill_rt [destroy all enemy radar towers]
    
39. /kill_own_rt [destroys all of radar jammers]
    
40. /kill_rh [destroys radio jammers]
    
41. /mustela [spawns a mustela which is a tank]
    
42. /mortar [spawns a mortar deploy]
    
43. /complete_campaign [complete the campaign]
    
44. /whereami [tell where u are on the map]
    
45. /1_win [win the area you on]
    
46. /1_lose [Lose the area you on]
    
47. /0_attack [makes the ai defend only...]
    
48. /test [Test yourself]
    
49. /defend [makes the ai defend only]
    
50. /kill_aa [destroy all of AA]
    
51. /modtest [ima not gonna bother this]
    
52. /sidinfo [im also not gonna bother this]
    
53. /kick_id [kick someone]
    
54. /kick
    
55. /wound [does something]
    
56. /enable_gps [does something]
    
57. /icecream [spawns a ice cream van]
    
58. /grenadier [spawns an grenadier]
    
59. /god [spawns a vest that is indestructible]
    
60. /cb4 [spawns a community box 4]
    
61. /cb5 [ spawns a community box 5]
    
62. /177 [no clue]
    
63. /guntruck [a gun truck]
    
64. /noxe [spawns a vehicle]^1
    
65. /legion [spawns a vehicle]^1
    
66. /m528 [spawns a vehicle]^1
    
67. /croc [spawns a flame thrower vehicle]
    
68. /sev90 [spawns a vehicle]^1
    
69. /repair_crane [spawns a repair vehicle]^1
    
70. /repair_tank [spawns a repair vehicle flare]^1

And thats all i could find on RWR...

update 0.0.0.0.0.0.0.1:
Fix one grammar
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update 0.0.0.0.0.0.1.1:
add some information for RP and XP
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update 0.0.0.0.0.1.1.1:
The Community boxes and gb1-3 gives you 2 random things that you can get... Like a laptop or a AA-12...
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update 0.0.0.0.1.1.1.1:
Added screenshots for people who are having trouble with the codes
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update 0.0.0.1.1.1.1.1:
move the updates to a brand new section
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update 0.0.1.1.1.1.1.1:
added 1 sentence in the codes section
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update 0.1.1.1.1.1.1.1:
Added some new codes/ dont ask how i got them
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update 1.1.1.1.1.1.1.1:
Remove all of " in "
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update 1.1.1.1.1.1.1.2 part 2:
some mods disable certian items
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update 1.1.1.1.1.1.3:
fix a couple missing text
also added one more code
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update 1.1.1.1.1.1.4:
add like 1 new information
fix a couple more grammers
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update 1.1.1.1.1.1.5:
add more codes
add a new section for side notes
more information
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update 1.1.1.1.1.1.6:
Thanks to " ILikeMoney " for pointing out a mistake i made which is the /gdl which suppose to be /dgl