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Reach the charger where it is, instead of waiting for it to call

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OCPP asks the charger to dial us: a public endpoint, a TLS certificate, and a
route in through the customer's router. Our own handler then demanded two more
things the V1 does not offer — TLS on a charger that connects over ws://, and
Basic auth credentials the Anker app has no field for — so every connection was
turned away before the upgrade.

Anker publishes a Modbus TCP register map for this charger, and it inverts the
problem: we dial the charger, on its own network, with no inbound reachability
to arrange. That works for a charger behind a router that OCPP cannot reach at
all.

internal/modbus is the protocol, hand-rolled against the spec like the MQTT and
WebSocket clients beside it. The plugin's modbus.go is the V1's map: the same
0-8 status enum the cloud already reports, per-phase measurements, and the
writable registers behind start, stop, current limit, boost and phase mode. A
new "modbus" control mode routes the existing control endpoints down it, so the
REST surface, the rate limit, the confirmation step and the audit trail are the
ones already there.

The commands the register map has no equivalent for say so by name rather than
failing as unknown, and a current below the charger's 6 A floor is refused
because it pauses the charge rather than slowing it.

Co-Authored-By: Claude Opus 5 <noreply@anthropic.com>
This commit is contained in:
tajniak81
2026-09-01 17:03:27 +02:00
co-authored by Claude Opus 5
parent e9a82a1cca
commit f7472bada3
13 changed files with 1658 additions and 47 deletions
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API Server/internal/api/server.go
+2
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@@ -451,6 +451,8 @@ func (s *Server) Handler() http.Handler {
mux.HandleFunc("GET /api/integrations/anker-solix/chargers/{sn}/control", s.handleAnkerControlStatus)
mux.HandleFunc("POST /api/integrations/anker-solix/chargers/{sn}/control/token", s.handleAnkerControlToken)
mux.HandleFunc("DELETE /api/integrations/anker-solix/chargers/{sn}/control/token", s.handleAnkerControlRevoke)
mux.HandleFunc("PUT /api/integrations/anker-solix/chargers/{sn}/control/address", s.handleAnkerControlAddress)
mux.HandleFunc("DELETE /api/integrations/anker-solix/chargers/{sn}/control/address", s.handleAnkerControlAddress)
mux.HandleFunc("POST /api/integrations/anker-solix/chargers/{sn}/{action}", s.handleAnkerControlAction)
// OCPP WebSocket endpoint the charger dials out to (own/proxy modes). It sits