Passando de string para JSON

[DavidCoopermine]

Estou tentando a dias passar esse retorno (string) para um JSON valido.

name=lucia service=pppoe caller-id=00:1A:3F:19:D3:FB address=173.22.15.236 uptime=1w2d8h38m57s encoding= session-id=0x81100027 limit-bytes-in=0 limit-bytes-out=0 1 R name=pontocom service=pppoe caller-id=00:1A:3F:1C:82:97 address=173.22.15.235 uptime=1w2d8h38m56s encoding= session-id=0x81100028 limit-bytes-in=0 limit-bytes-out=0 2 R name=nivaldo service=pppoe caller-id=C8:3A:35:30:70:60 address=173.22.15.228 uptime=1w2d8h38m52s encoding= session-id=0x81100032 limit-bytes-in=0 limit-bytes-out=0 3 R name=celestino service=pppoe caller-id=00:02:6F:9D:ED:02 address=173.22.15.222 uptime=1w2d8h38m41s encoding= session-id=0x81100041 limit-bytes-in=0 limit-bytes-out=0 4 R name=mobilepraca service=pppoe caller-id=4C:5E:0C:2D:F7:98 address=138.121.167.230 uptime=1w2d8h38m15s encoding= session-id=0x8110007A limit-bytes-in=0 limit-bytes-out=0

São 4 registros. alguém tem uma ideia como fazer?