Creating APNS certificates

1. Make CSR file using Keychain
2. Export its private key as PushChatKey.p12 without password
3. Convert it to PEM format pkcs12 -nocerts -in PushChatKey.p12 -out PushChatKey.pem -nodes
4. Generate Apple push certification and download it as 'aps_development.cer'
5. Convert it to PEM format openssl x509 -in aps_development.cer -inform der -out PushChatCert.pem
6. Merge the two PEM files cat PushChatCert.pem PushChatKey.pem > ck.pem