=== ENVIRONMENT
PHP:        8.2.35
host:       mksmc.ddns.net
uri:        /electricity/debug_modbusp1.php
folder->db: electricity   (db_connection.php uses the FIRST folder of the URL as db name)
database:   electricity
log file:   C:\wamp64\www\electricity/_debug_modbusp1.log (folder writable)

=== TABLE modbusp1_log
  id          int(11)
  timestamp   timestamp
  gateway_ip  varchar(200)
  slave_id    int(11)
  meter_id    varchar(200)
  a_voltage   int(11)
  a_current   decimal(10,2)
  a_power     int(11)
  a_kwh       int(11)
  total_kwh   int(11)
  deleted     varchar(200)
all needed columns present

last 5 rows:
  {"id":"163746","timestamp":"2026-11-12 08:55:42","gateway_ip":"202.178.123.116,192.168.21.45","slave_id":"32","meter_id":"202612615408","a_voltage":"230","a_current":"13.14","a_power":"3027","a_kwh":"322","total_kwh":"322","deleted":"0"}
  {"id":"163745","timestamp":"2026-11-12 08:55:42","gateway_ip":"202.178.123.116,192.168.21.45","slave_id":"31","meter_id":"202612615351","a_voltage":"231","a_current":"0.00","a_power":"0","a_kwh":"20","total_kwh":"20","deleted":"0"}
  {"id":"163744","timestamp":"2026-11-12 08:55:42","gateway_ip":"202.178.123.116,192.168.21.45","slave_id":"30","meter_id":"202612615346","a_voltage":"224","a_current":"0.00","a_power":"0","a_kwh":"138","total_kwh":"138","deleted":"0"}
  {"id":"163743","timestamp":"2026-11-12 08:55:42","gateway_ip":"202.178.123.116,192.168.21.45","slave_id":"29","meter_id":"202612615389","a_voltage":"224","a_current":"27.13","a_power":"6088","a_kwh":"1040","total_kwh":"1040","deleted":"0"}
  {"id":"163742","timestamp":"2026-11-12 08:55:42","gateway_ip":"202.178.123.116,192.168.21.45","slave_id":"28","meter_id":"202612615365","a_voltage":"230","a_current":"12.57","a_power":"2895","a_kwh":"518","total_kwh":"518","deleted":"0"}

=== meter_list (modbus entries)
  {"meter_id":"202612615548","gateway_ip":"192.168.0.41","slave_id":"34","log_table":"modbusp1_log","deleted":"0"}
  {"meter_id":"202612615434","gateway_ip":"192.168.0.42","slave_id":"103","log_table":"modbusp1_log","deleted":"0"}
  {"meter_id":"202612615353","gateway_ip":"192.168.0.42","slave_id":"112","log_table":"modbusp1_log","deleted":"0"}
  {"meter_id":"202612615416","gateway_ip":"192.168.0.42","slave_id":"100","log_table":"modbusp1_log","deleted":"0"}
  {"meter_id":"202612615349","gateway_ip":"192.168.0.42","slave_id":"102","log_table":"modbusp1_log","deleted":"0"}
  {"meter_id":"202612615401","gateway_ip":"192.168.0.42","slave_id":"99","log_table":"modbusp1_log","deleted":"0"}
  {"meter_id":"202612615345","gateway_ip":"192.168.0.42","slave_id":"111","log_table":"modbusp1_log","deleted":"0"}
  {"meter_id":"202612615375","gateway_ip":"192.168.0.42","slave_id":"107","log_table":"modbusp1_log","deleted":"0"}
  {"meter_id":"202612615344","gateway_ip":"192.168.0.42","slave_id":"98","log_table":"modbusp1_log","deleted":"0"}
  {"meter_id":"202612615373","gateway_ip":"192.168.0.42","slave_id":"110","log_table":"modbusp1_log","deleted":"0"}
  {"meter_id":"202612615360","gateway_ip":"192.168.0.42","slave_id":"105","log_table":"modbusp1_log","deleted":"0"}
  {"meter_id":"202612615357","gateway_ip":"192.168.0.42","slave_id":"113","log_table":"modbusp1_log","deleted":"0"}
  {"meter_id":"202612615474","gateway_ip":"192.168.0.42","slave_id":"101","log_table":"modbusp1_log","deleted":"0"}
  {"meter_id":"202612615354","gateway_ip":"192.168.0.42","slave_id":"106","log_table":"modbusp1_log","deleted":"0"}
  {"meter_id":"202612615423","gateway_ip":"192.168.0.42","slave_id":"109","log_table":"modbusp1_log","deleted":"0"}
  {"meter_id":"202612615378","gateway_ip":"192.168.0.42","slave_id":"104","log_table":"modbusp1_log","deleted":"0"}
  {"meter_id":"202612615356","gateway_ip":"192.168.0.42","slave_id":"108","log_table":"modbusp1_log","deleted":"0"}
  {"meter_id":"202612615396","gateway_ip":"192.168.0.42","slave_id":"125","log_table":"modbusp1_log","deleted":"0"}
  {"meter_id":"202612615455","gateway_ip":"192.168.0.42","slave_id":"129","log_table":"modbusp1_log","deleted":"0"}
  {"meter_id":"202612615374","gateway_ip":"192.168.0.42","slave_id":"118","log_table":"modbusp1_log","deleted":"0"}

=== LOG (last 100 lines)   ?clear=1 to empty, ?test=1 for a test insert
(no log yet - nothing has POSTed to this file)