Solution : https://service.sap.com/sap/support/notes/34998 (SAP Service marketplace login required)
Key words : 
sapinfo r3name=<system id> mshost=<message server> group=<logon group> general remarks, /bin/cshcd  /sapmnt/<system id>/exe/rfcsdk/binsapinfo -3 -, <system id>     2> nullif errorlevel 1 goto sys_down, <sapgui path>\rfcsdk\bin\sapinfo -3 -, additional key words alive-check, sapinfo ashost=<host> sysnr=<instance, <system id>  >&  /dev/nullif, /bin/csh# count 10 workpocesses, reliable central remote maintenance, rfc function module rfc_system_info
Related Notes : 
       
| 64016 | Using the SAP Gateway monitor GWMON | 
| 64015 | Description of test program lgtst | 
| 63347 | List: CPIC error codes | 
| 42692 | Test tool for RFC links: sapinfo | 
| 29276 | SAPCPIC: At which points are passwords visible |