OpenEMS: enable grid charging (#22951)

templates/definition/meter/openems.yaml

@@ -33,6 +33,8 @@ params:
       en: adjusted to the API timeout
     usages: ["battery"]
     advanced: true
+  - name: maxchargepower
+    default: 4200
   - name: maxacpower
   - name: capacity
     advanced: true
@@ -85,7 +87,7 @@ render: |
           method: POST
           headers:
           - content-type: application/json
-          body: '{"value":0}'
+          body: '{"value": 0}'
       - case: 2 # hold
         set:
           source: http
@@ -97,11 +99,19 @@ render: |
           method: POST
           headers:
           - content-type: application/json
-          body: '{"value":0}'
-      - case: 3 # charge (not implemented)
+          body: '{"value": 0}'
+      - case: 3 # charge
         set:
-          source: error
-          error: ErrNotAvailable
+          source: http
+          uri: http://{{ .host }}/rest/channel/{{ .battery }}/SetActivePowerLessOrEquals
+          auth:
+            type: basic
+            user: x
+            password: {{ .password }}
+          method: POST
+          headers:
+          - content-type: application/json
+          body: '{"value": {{ mul .maxchargepower -1 }}}' # charge power is negative
   {{- end }}
   capacity: {{ .capacity }} # kWh
   {{- end }}