@Anaisdg, below is an example of a single single that I can write via Postman or my device:
DEVELOPMENT_DATA,unit=DEVELOPMENT val1=584.00,val2=3562.53,val3=1,CommConn=0 1572275666000000000
Below is an example of the contents of a text file I can send via Postman and it writes to the database. When I send from my device I receive a response that it is sent but the data is not written to the database.
DEVELOPMENT_DATA,unit=DEVELOPMENT val1=584.00,val2=3562.53,val3=1,CommConn=0 1572275666000000000
DEVELOPMENT_DATA,unit=DEVELOPMENT val1=578.00,val2=3572.94,val3=1,CommConn=0 1572275671000000000
DEVELOPMENT_DATA,unit=DEVELOPMENT val1=591.00,val2=3578.96,val3=1,CommConn=0 1572275676000000000
DEVELOPMENT_DATA,unit=DEVELOPMENT val1=576.00,val2=3586.59,val3=1,CommConn=0 1572275681000000000
DEVELOPMENT_DATA,unit=DEVELOPMENT val1=571.00,val2=3590.74,val3=1,CommConn=0 1572275686000000000
DEVELOPMENT_DATA,unit=DEVELOPMENT val1=593.00,val2=3595.50,val3=1,CommConn=0 1572275691000000000
DEVELOPMENT_DATA,unit=DEVELOPMENT val1=580.00,val2=3597.73,val3=1,CommConn=0 1572275696000000000
DEVELOPMENT_DATA,unit=DEVELOPMENT val1=575.00,val2=3599.66,val3=1,CommConn=0 1572275701000000000
DEVELOPMENT_DATA,unit=DEVELOPMENT val1=572.00,val2=3600.00,val3=1,CommConn=0 1572275706000000000
DEVELOPMENT_DATA,unit=DEVELOPMENT val1=582.00,val2=3599.07,val3=1,CommConn=0 1572275711000000000
DEVELOPMENT_DATA,unit=DEVELOPMENT val1=584.00,val2=3562.53,val3=1,CommConn=0 1572275666000000000
DEVELOPMENT_DATA,unit=DEVELOPMENT val1=578.00,val2=3572.94,val3=1,CommConn=0 1572275671000000000
DEVELOPMENT_DATA,unit=DEVELOPMENT val1=591.00,val2=3578.96,val3=1,CommConn=0 1572275676000000000
DEVELOPMENT_DATA,unit=DEVELOPMENT val1=576.00,val2=3586.59,val3=1,CommConn=0 1572275681000000000
DEVELOPMENT_DATA,unit=DEVELOPMENT val1=571.00,val2=3590.74,val3=1,CommConn=0 1572275686000000000
DEVELOPMENT_DATA,unit=DEVELOPMENT val1=593.00,val2=3595.50,val3=1,CommConn=0 1572275691000000000
DEVELOPMENT_DATA,unit=DEVELOPMENT val1=580.00,val2=3597.73,val3=1,CommConn=0 1572275696000000000
DEVELOPMENT_DATA,unit=DEVELOPMENT val1=575.00,val2=3599.66,val3=1,CommConn=0 1572275701000000000
DEVELOPMENT_DATA,unit=DEVELOPMENT val1=572.00,val2=3600.00,val3=1,CommConn=0 1572275706000000000
DEVELOPMENT_DATA,unit=DEVELOPMENT val1=582.00,val2=3599.07,val3=1,CommConn=0 1572275711000000000
DEVELOPMENT_DATA,unit=DEVELOPMENT val1=584.00,val2=3562.53,val3=1,CommConn=0 1572275666000000000
DEVELOPMENT_DATA,unit=DEVELOPMENT val1=578.00,val2=3572.94,val3=1,CommConn=0 1572275671000000000
DEVELOPMENT_DATA,unit=DEVELOPMENT val1=591.00,val2=3578.96,val3=1,CommConn=0 1572275676000000000
DEVELOPMENT_DATA,unit=DEVELOPMENT val1=576.00,val2=3586.59,val3=1,CommConn=0 1572275681000000000
DEVELOPMENT_DATA,unit=DEVELOPMENT val1=571.00,val2=3590.74,val3=1,CommConn=0 1572275686000000000
DEVELOPMENT_DATA,unit=DEVELOPMENT val1=593.00,val2=3595.50,val3=1,CommConn=0 1572275691000000000
DEVELOPMENT_DATA,unit=DEVELOPMENT val1=580.00,val2=3597.73,val3=1,CommConn=0 1572275696000000000
DEVELOPMENT_DATA,unit=DEVELOPMENT val1=575.00,val2=3599.66,val3=1,CommConn=0 1572275701000000000
DEVELOPMENT_DATA,unit=DEVELOPMENT val1=572.00,val2=3600.00,val3=1,CommConn=0 1572275706000000000
DEVELOPMENT_DATA,unit=DEVELOPMENT val1=582.00,val2=3599.07,val3=1,CommConn=0 1572275711000000000
I set up syslog this morning so I can see in Chronograf that the POST write commands are being seen by telegraf.